Sin600.cos330.+cos120.sin150
Answers
Answered by
6
Step-by-step explanation:
sin(660°)cos(330°) +cos(120°)sin(150°) =>
sin(720°-60°)cos(360°-30°) +
cos(180°-60°)sin(180°-30°) =>sin(60°)cos(30°)- cos(60°)sin(30°) =>
sin(x)cos(y)-cos(x)sin(y) =sin(x-y) => sin(60°-30°) =>sin(30°) => 1/2. Hope it helps you.
Similar questions