Question

Найдите 10sin4a/3cos2a , если sin2a = 0.6

Answer 1

$frac{10sin4a}{3cos2a}= frac{10*2sin2a*cos2a}{3cos2a}= frac{20sin2a}{3}\\sin2a=0,6\\ frac{20*0,6}{3}= frac{12}{3}=4$