# trignometry

1. ### Prove the equation

sin2x+cos2x=1
2. ### Trignometry 11 Questions

Hi, I have two questions that I am stuck on. I have tried but am stuck. Any help is greatly appreciated! 1. A plane takes off at a 15 deg angle and flies at an average speed of 660 km/h. How high will it be two minutes after its wheels have left the earth? Round your answer to the nearest tenth...
3. ### trignometry

A boat sets off on a trip from S.it heads towards B,a point 6km away and due north.At B it changes direction and heads towards point C,also 6km away and due east of B.At C it changes the direction again and heads on a bearing of 135towards Dwhich is 13km from C. a) Calculate the distance...
4. ### Parabola Trignometry

Hi, could someone please help me with part (a) of this question. I understand everything except that part... Thanks heaps.
5. ### Trignometry - modelling and problem solving

From a point A due north of a tower, the angle of elevation to the top of the tower is 45 degrees. From point B, 100M on a bearing of 120 DEGREES FROM A the angle of elevation is 26 degrees. Find the height of the tower. Please can you help with this problem
6. ### trignometry question

Can someone please help me with this question.. I attempted it and got the correct ans for the first 3 parts but for the last part my ans was wrong, and I couldn't figure out why One end of a piece of elastic is attatched to a point at the top of a door frame and the other end hangs freely. A...
7. ### Matrices related to trignometry and vectors

Hey guys! I am stack at this problem and not sure how I have to proceed, in the first part, when it says find the matrix for that rotation , does it mean from Q to P? do I find that by writing a trigonometric function of that and put it in an augmented matrix form? B part...no clue.., C) is ok...
8. ### need help "stretching" a line and ending on a specific angle against axis

Here's a problem I assumed would be easy, but it has melted my brain for a long time and I am not really sure anymore. So I am using cos and sin to draw round curves in a program (it's okay that it's slow). You specify an x length, y length, and angle1 and angle2 with the axises you want the...
9. ### how to solve the following using Euler identity .

show that exp (i (x + y)) = exp (ix) exp (iy)
10. ### A problem involving Inverse trignometry.

Solve the equation: Tan-1 [(x-1)/(x-2)] + Tan-1 [(x+1)/(x+2)] = π/4
11. ### Trignometry help with compass directions.

A pilgrim travelling along a road, which at this point runs due North and is straight, observes a sign by the wayside warning travellers to the North that the den of Ali Baa Baa and his 40 thieves is located at a bearing of 49o T at a distance of 8km. Ali's gang uses a herd of camels in their...
12. ### 3D Trignometry problem - how to calculate the Horizontal distance?

Refer to the (very ordinary) 3d diagram below. Formulae required to determine HD. Slope Distance (SD), angles and dH are measureable. A 3d soulition is required with no approximations, if possible.
13. ### equality proof

anybody knows how to solve this ? im reviewing for my test,any help is highly appreciated
14. ### Simpler way to graph multiple trig. functions?

hey everybody, hope you enjoying maths :) so in class we are graphing functions like this: y = 3cos2x + 2sin3x + 1 and we are supposed to draw 3cos2x and 2sin3x + 1 separately than add their y-values at certain x-values to get the first function. This is sometimes painstaking and very...
15. ### SOLVED Another simple trig identity

This looks simple of paper but for the life of me I can't seem to figure it out (Headbang) LS=cos(x-y)cosy-sin(x-y)siny RS= cosx Greatly appreciated!
16. ### SOLVED Solving a trig identity

LS=(tanx-tany)/(cotx-coty) LS=-tanxtany If possible try to avoid use of the tan compound formula. Thanks!
17. ### trignometry confusion

1]the equation1-\cos^ x + \sinx\cosx = k then there exists real solution when k belongs to A)0<k<\frac{1+\sqrt2}{2} B)2-\sqrt3 < k 2+\sqrt3 C)0<k<2-\sqrt3 D)\frac{1-\sqrt2}{2} < k < \frac{1+\sqrt2}{2} 2]let a,b belong to the set [0,\frac{\pi}{2}] if sin^6 a+3\sin^2 a\cos^2 a+\cos^6 b=1 then...
18. ### Problem with functions and Trignometry

Hey all, I'am a university student doing first year differential calculas and unfortunately for me, I don't have a very developed base in some portions of this course. I'am currently doing chapter 1 & 2 and I'am having some problems with functions and Trignometry. Trignometric problem...
19. ### trignometry

solve the eqn: 1/log(base 4) (x+1)/(x+2) < 1/log(base 4) (x+3) regret me the topic is LOGARITHMS
20. ### [SOLVED] Trignometry and Radians

Here's the question I have solved the first part and got the following equation, which is correct: y=(6sin2x)+3 Now for part (ii) I have solved till sin2x=\frac{-1}{2} And don't know how to get the correct answer: Thanks in advance!