Prove that cos^2(pi/4-a)-sin^2(pi/4-a)=sin2a
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thethe means and extremes of the number are matched by the first of all we have to check the number and after that we need to take out the sum of the month after some them we need to take out the sum and we need to divide the both after that we will get a digit or a number which is known as mean or an extreme
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