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kropot72Best ResponseYou've already chosen the best response.0
Use the following formula: \[\cos 2A=2\cos ^{2}A1\] \[\cos 2A=(2\times (\frac{\sqrt{3}}{4})^{2})1=you\ can\ calculate\]
 11 months ago

CUTE_AKKIBest ResponseYou've already chosen the best response.0
cos2A=2cos2A−1 put cos A= √3/4 so cos2A=2*(√3/4)*(√3/4)1
 11 months ago
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