nilai dari sec 300° tan 150° cos 240° tolong bantu beserta penyelesaiannya

sec 300° tan 150° cos 240° = ...

sec 300 = sec (360° - 60°) = - sec 60° = 2 / √3

tan 150° = tan (180° - 30°) = - tan 30° = - ⅓ √3

cos 240° = cos (180° + 60°) = - cos 60° = - ½

sec 300° tan 150° cos 240°
= (2 / √3) ( -⅓ √3 ) ( -½ )
= ( - ⅔ ) ( - ½ )
= ⅓