Дано: sin (4π+t) = 3/5, 0

Sin (4π + t) = 3/5

Sint = 3/5

Cost = + - √ (1 - Sin²t)

Так как t - угол первой четверти, то

Cost = √ (1 - Sin²t) = √ (1 - 9/25) = √16/25 = 4/5

tg (π - t) = - tgt = - Sint/Cost = - 3/5 : 4/5 = - 3/4 = - 0,75

Sin (4π+t) = 3/5,

0
tg (π-t) - ?

sin (4π+t) = sint=3/5

tg (π-t) = - tgt

-tgt=-sint/cost

cos=√1-sin²t=√1-9/25=√16/25

cost=4/5

-tgt=-3/5*5/4=-3/4