Объяснение:
т. к. π/2<t<π то sint >0 а cost<0
cos²t = 1- sin²t = 1- 64/289 = 225/289
cost = -15/17
tgt = sint/cost = -8/17 * 17/15 = -8/15
сtgt = 1/tgt = -15/8
Объяснение:
т. к. π/2<t<π то sint >0 а cost<0
cos²t = 1- sin²t = 1- 64/289 = 225/289
cost = -15/17
tgt = sint/cost = -8/17 * 17/15 = -8/15
сtgt = 1/tgt = -15/8