Question

ayudenme a resolver es urgente y 2cos^2 x/2 es igual a

Answer 1

$E=\dfrac{\cot\left(45\°-\dfrac{x}{2}\right)-\tan x+1}{2\cos^2\dfrac{x}{2}}\\ \\ \\ E=\dfrac{\sqrt{\dfrac{1+\cos(90\°-x)}{1-\cos(90\°-x)}}-\tan{x}+1}{1+\cos x}\\ \\ \\ E=\dfrac{\sqrt{\dfrac{1+\sin{x}}{1-\sin{x}}}-\tan{x}+1}{1+\cos x}\\ \\ \\ E=\dfrac{\sqrt{\dfrac{(1+\sin{x})(1+\sin{x})}{(1-\sin{x})(1+\sin{x})}}-\tan{x}+1}{1+\cos x}\\ \\ \\ E=\dfrac{\dfrac{1+\sin{x}}{\cos x}-\tan x+1}{1+\cos x}\\ \\ \\ \boxed{E=\sec x}$

Answer 2

espero que te sirve...saludos