If sina is 24/25then find cosa
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Solution:
It is given that,
sinA = 24/25
We know that,
cos²A = 1-sin²A
= 1- (24/25)²
=(25²-24²)/25²
= [(25+24)(25-24)]/25²
= 49/25²
= (7/25)²
Therefore,
cosA = √(7/25)= 7/2
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