Question

cos^2(45+x) - Sin^2(45-x)= ?

Answer 1

Assuming that the numbers are in degrees, you can use the phase shift identities to change a sin into a cos.

But what you have up here is a unsolvable in 1 dimension, because you have two unknowns, X and ?

Answer 2

Presumably wants a simplification

Answer 3

Two unknowns..... But I want to solve it...... Here see my work....
Can I write it as [cos(45+x)]^2 - [sin(45-x)]^2 ?

Answer 4

@estudier if the choices are A)0 B) 1 C)-1 D) 2

Answer 5

I think its zero..... WHat do u say ?

Answer 6

sin (45-x)=cos (90-45+x) = cos (45+x)
so answer =0

Answer 7

thanks,,,..!

Answer 8

welcome :)