I beg all of you to pls help me to solve this trigonometric identities equation..the problems are 10, i already solve 5 and obviously, there's a remaining 5 problems..I can't solve them i mean i've been solving those remaining 5 questions for 5 hours and still no success..pls help me...these are the questions...
* those enclosed in parentheses indicated that the number inside is an exponent)
* / = over e.g. cosx/sinx (cosx over sinx)
1.) cos(4)x - sin(4)x = 2cos(2)x - 1
2.) 1 - (sinx / cscx) = cosx / secx
3.) tan x / (1 - tan(2)x) = cosx / (cscx - 2sinx)
4.) secx sinx / (tanx +cotx) = sin(2)x
5.) cos(2)x - sin(2)x = 1 - 2sin(2)x
plss help me...thank you in advance for those who'll helped...
Godbless you all!!!
i'm terribly sorry for i ask a lot of questions..i'm really sorry..i'm really analyzing it but i need to be guided sometimes..i'm really sorry.. im confused again with this one...
Regarding Question 5:
how did u express secx sinx to sinx / cosx?
sinx /cosx in terms of quotient relation is equivalent to tanx
another things is that secx sinx in terms of product relation is equivalent to tanx (the original form is sinx secx, i just interchange them)
tnx for the reminder...huhuhuh i'm really sorry...