Question

Докажите тождество
(cos a/cos 4a-sin a/sin 4a)*cos 6a-cos 10a/sin 3a=4cos 2a

Answer 1

Ответ: cos(a)/cos(4*a-sin(a))*sin(4*a)*cos(10*a)/sin(3*a)-4*cos(2*a)=0