57.The value of 5-5cos2A is:
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Step-by-step explanation:
take 5 common from 5-5cos2A
-> 5(1-cos2A) __(1)
now we know that :
cos2A = 1 - 2sin^2A
=> 2sin^A = 1 - cos2A (put this value in equation 1)
it becomes ;
5(2sin^2A)
=> 10 sin^2A
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