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4 cos A 3 cos A, when A-30verity cos 34-4Verily |
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Answer» cos3A=4cos³A-3cosAA=30 Cos90=4cos³30-3cos30 0=4(√3/2)³-3(√3/2)0=4(3√3/8)-3√3/20=3√3)2-3√3/20=0 Verified |
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