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Sin263--Sin2 270Cos2 170+ Cos2 730 |
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Answer» iven, COS 2 17+cos 2 73sin 2 63+SIN 2 27 = cos 2 (17)+(cos(90−17)) 2 sin 2 63+(sin(90−63)) 2 As we know90−63=2790−17=73from (sin(90−63)=cos63, cos(90−17)=sin17,Now,cos 2 17+cos 2 73sin 2 63+sin 2 27 = cos 2 (17)+(cos(90−17)) 2 sin 2 63+(sin(90−63)) 2 = cos 2 17+sin 2 17sin 2 63+cos 2 63 = 11 =1 ∵sin 2 A+cos 2 A=1 |
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