6. sin150 Sin(90+60)​=+cos60∘=+1/2 sin(180−30)=+sin30∘+1/2

6. sin150 Sin(90+60)​=+cos60∘=+1/2 sin(180−30)=+sin30∘+1/2 7cos120∘cos(90+30)=−sin30∘=+1/2cos(180∘−60)=−cos60∘=−1/2​ cos(90+60)=−sin60∘=−8​/2cos(180∘−30)=−cos30=−3​/2​ cos150
Video solution 1: 6. sin150 Sin(90+60)​=+cos60∘=+1/2 sin(180−30)=+sin30∘+1/2 7cos120∘cos(90+30)=−sin30∘=+1/2cos(180∘−60)=−cos60∘=−1/2​ cos(90+60)=−sin60∘=−8​/2cos(180∘−30)=−cos30=−3​/2​ cos150
Video solution 2: 6. sin150 Sin(90+60)​=+cos60∘=+1/2 sin(180−30)=+sin30∘+1/2 7cos120∘cos(90+30)=−sin30∘=+1/2cos(180∘−60)=−cos60∘=−1/2​ cos(90+60)=−sin60∘=−8​/2cos(180∘−30)=−cos30=−3​/2​ cos150

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