Question

упростить выражения
1) cos a - ctg a (-sin a)
2) tg(-a)*ctg(-a)+cos^2(-a)+sin^2a

Answer 1

I hope this helps you

Answer 2

рахмат

Answer 3

what

Answer 4

thank you

Answer 5

do you speak Russia?

Answer 6

yw, no i don't speak Russian