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Principle Of Mathematical Induction

Question

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Prove that:

$left parenthesis cosx plus cosy right parenthesis squared plus left parenthesis sinx minus siny right parenthesis squared equals 4 cos squared fraction numerator straight x plus straight y over denominator 2 end fraction$

Solution

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Some More Questions From Principle of Mathematical Induction Chapter

If in two circles, arcs of the same length subtend angles 60° and 75° at the centre, find the ratio of their radii.

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