Notice, the following formula cos2A+sin2A=1. 2sinAcosA=sin2A. cos2A−sin2A=cos2A. Now, we have. LHS=5cos2x−2√3sinx⋅cosx+3sin2x. ... <看更多>
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Notice, the following formula cos2A+sin2A=1. 2sinAcosA=sin2A. cos2A−sin2A=cos2A. Now, we have. LHS=5cos2x−2√3sinx⋅cosx+3sin2x. ... <看更多>