if cosx+sinx=4/3 find 2x and cos 4x

asked by guest
on Nov 15, 2024 at 3:49 am



You asked:

Given \( \cos\left( x \right) + \sin\left( x \right) = \frac{4}{3} \), evaluate \( 2 x \), \( \cos\left( 4 x \right) \).