(cos a -cos3a )(sin8a+sin2a)/(sin5a-sina)(cos4a-cos6a)=?
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(cos a -cos3a )(sin8a+sin2a)/(sin5a-sina)(cos4a-cos6a)
(cos a -cos3a )(sin8a+sin2a)/(sin5a-sina)(cos4a-cos6a)=?
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ur ANS is 1
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