Question

prove that cos4A = cosec4A - tan2A

Answer 1

I don't think it is right

Answer 2

cuz if u try to type the value of cos4 A in ur calculator,

u will get different answer by typing cosec4A - tan2A in ur calculator

Answer 3

let's see ...i might be wrong

Answer 4

right hand side is cot(4A)

Answer 5

put any arbitrary value pi/4

the r.h.s => cos pi = -1

on the right hand side you have csc pi = inf which is untrue

you must be putting particular value of A (solution), check every value ... the points where it intersects, the above must be true for all values of A
http://www.wolframalpha.com/input/?i=cos4A+%3D+cosec4A+-+tan2A