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Sin 70 degree + theta- cos 20 degree minus theta equal to zeron |
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Answer» Let COS(20-tetha) remain same.. Let US change Sin(70-tetha) As we know that... Sin(90-tetha)=Cos tetha Sin(70-tetha)=Cos[90-(70+tetha)] =Cos(20+tetha) Cos(20-tetha) - Cos(20-tetha) = 0 Hence proved... I hope it HELPS you follow me |
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