सिद्ध कीजिए कि \[ \cos \left(\frac{3 \pi}{4}+A\right)-\cos \left(\frac{3 \pi}{4}-A\right)=-\sqrt...
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0सिद्ध कीजिए कि
\[
\cos \left(\frac{3 \pi}{4}+A\right)-\cos \left(\frac{3 \pi}{4}-A\right)=-\sqrt{2} \sin A
\]
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