please help with these problems thanks!
1.
cos^2(75degrees)
2.
sec^2(15degrees)
also
FInd the exact value given that cosx=1/3 with x in quad I and sinB= -1/2 with B in quad IV.
sin(x-B)
I got (2(squareroot)6-1)/6 but Im not 100% sure.
Find the exact value given that sinA= -4/5 with A in quad IV, tanB= 7/24 with B in quad III, and cosC= -5/13 with C in quad II.
Any help is gratefully appreciated!!!
3.
You need to use the Pythagorean Identity, .
(We know that since x is in the first quadrant).
We also know . Once again, use the Pythagorean Identity.
(we know that because B is in the fourth quadrant.
Now we have .
We were trying to find .
For this we use the difference formula...
.
So you were VERY close...