Question

1)Nilai dari cosec (-300°) sama cos 1320° berapa........ Tolong bantu jawab dan pake cara

Answer 1

Cosec (- 300) = - cosec 300 = - cosec (360 -60) = -(-cosec 60) = cosec 60
= 2/3 √3

cos 1320 = cos ((3 x 360) + 240) = cos 240 = cos (180 + 60) = -cos 60 = -1/2