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If 2cosA5=, find the value of 4 + 4 tan2 A

Answer» CosA =5/2=B/HP=√(5)2-(2)2=√25-4=√21TanA=P/B=√21/5=4+4*(√21/5)2=4+4*21/25=4+3.36=7.36


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