pt geometrically cos (×+y)=cost cosy-sinx siny
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.AFTER ,
ON-QR/OP
=ON/OP-QR/OP
=ON/OQ×OQ/OP - OR/PQ ×PQ/OP
=CosACosB-SinASinB
just put X and Y instead Of a A and B
ON-QR/OP
=ON/OP-QR/OP
=ON/OQ×OQ/OP - OR/PQ ×PQ/OP
=CosACosB-SinASinB
just put X and Y instead Of a A and B
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meghanaacharya:
this is not the answer
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