Question

25-i please give me answere

Answer 1

Hey dude!!

Here's the correct answer

_______________________

${ \cos}^{2} ( \frac{\pi}{4} + x) - { \sin}^{2} ( \frac{\pi}{4} - x) \\ = { \cos}^{2} \frac{\pi}{4} + { \cos }^{2} x - { \sin }^{2} \frac{\pi}{4} + { \sin}^{2} x \\ = { \cos}^{2} 45 \: degree + { \cos }^{2} x - { \sin }^{2} 45 \: degree + { \sin}^{2} x \\ = 1 + { \cos }^{2} x - 1 + { \sin}^{2} x \\ = { \sin }^{2} x + { \cos }^{2} x \\ = 1$

_______________________

I know it helps you!! xD