Question

Спростити вираз
sin2a-cos2a+1

Answer 1

A)-cos2a +1
b)-sinb^2

Answer 2

$\sin ^2\left(a\right)-\cos ^2\left(a\right)+1=1-\cos \left(2a\right) \\ ctg^2\beta \cdot \:sin^2\beta -1=-sin(\beta)^2$