Question

Упростить выражение: а)sin^2 (pi+t)-sin^2 (pi-t)
б) cos(pi/2+t)/sin(pi-t) * tg(-1)

Answer 1

(sin(pi+t)+sin(pi-t))*(sin(pi+t)-sin(pi-t))=(2sin pi*cos t)*(2sin t*cos pi)
4sin t*cos t* sin pi *cos pi=sin 2t*sin 2pi