Tgt*cos(-t)+sin(пи+t)

Question

Tgt*cos(-t)+sin(пи+t)

Answer 1

= tg t*cos t - sin t = sin t/cos t * cost - sin t = sin t - sin t = 0

Answer 2

Tgt*cos(-t)+sin(π+t)= sin t/cos t * cost - sin t = sin t - sin t = 0