Question

$frac{sin2 alpha }{cos ^{2} alpha -sin^{2} beta }$
Упростите

Answer 1

$frac{sin2 alpha }{cos^2 alpha -sin^2 alpha }=frac{sin2 alpha }{cos2 alpha }=tg2 alpha$

Answer 2

sin2α/(cos²α-sin²α)=sin2α/cos2α=tg2α