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Expand cos(a+b+c) and hence prove that cosa cosb cosc=sina sinb cosc+ sinb sinc cosa +sinc sina cosb ,if a+b+c=90

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Expand cos(a+b+c) and hence PROVE that cosa cosb COSC=sina sinb cosc+ sinb sinc cosa +sinc sina cosb ,if a+b+c=90



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