Question

what is the value of (cos2 67°-sin2 23°) ?

Answer 1

cos

This can be written as:

sin^2(90–67) -sin^2 

[As sin(90–α)=cos α]

So, 

Thus,the answer is 0.

Answer 2

Heya !!!



( Cos² 67° - Sin² 23° )




As we know that,



Cos² (90- Theta ) = Sin² theta


So,



=> Cos² ( 90° - 23°) - Sin² 23°




=> Sin² 23° - Sin² 23°



=> 0



★ HOPE IT WILL HELP YOU ★