Question

Daca cos x=a, calculati P=sinx/2 ori sin5x/2 in functie de a.

Answer 1

cosx = a => x = arccosa
P = sin$\frac{x}{2}$*sin$\frac{5x}{2}$
P = sin$\frac{arccosa}{2}$*sin$\frac{5arccosa}{2}$