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यदि sin (A-B)=sin A cos B- cos A sin B ...

यदि ` sin (A-B)=sin A cos B- cos A sin B ` तथा ` cos (A-B)= cos A cos B + sin A sin B ` हो , तो `sin 15^(@)` तथा ` cos 15^(@)` का मान ज्ञात करो ।

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