Find sin27sin63- cos63cos27
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= sin27sin63 - cos63cos27
= sin27.cos(90-63) - sin(90-63).cos27
= sin27.cos27 - sin27.cos27
= 0
= sin27.cos(90-63) - sin(90-63).cos27
= sin27.cos27 - sin27.cos27
= 0
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