Question

Решите..............

Answer 1

$5^{x^2}=2^{log_25} \ 5^{x^2}=5 \ x^2=1 \ x=pm1$

$y= frac{5}{ sqrt{x-5} } \ x-5>0 \ x>5$

$frac{(1-cos alpha )(1+cos alpha )}{sin alpha } = frac{1-cos^2 alpha}{sin alpha } = frac{sin^2 alpha}{sin alpha } =sin alpha$