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Cos sq 67-sinsq23 |
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Answer» Cos^2 67- Sin^2 23Cos^2(90-23) - Sin^2 23Sin^2 23 -Sin^2 230 Hence proved... cos sq67 - sin sq23=cos sq(90-23) - sin sq23=sin sq23-sin sq23=0 Cos²a 67 - cos²(90 - 23).................. Cos²a67 - cos² 67................ 0 is the answer |
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