Question

Упростите выражение
1-cos2asin(Π-a)

Answer 1

1-cos 2a / sin (pí-a) =(1-cosˇ2a +sinˇ2a)/sina=

=2.sinˇ2 a/sina = 2.sin a

Formuli: sin (pí-a) = sina, cosˇ2 = cosˇ2a -sinˇ2 a