Question

If sin A= 13 find cos A​

Answer 1

Answer:

sin A=13

${sin \: a}^{2} + {cos \: a}^{2} = 1 \\ { {13}^{2} } + {cos \: a}^{2} = 1 \\ 169 + {cos}^{2} = 1 \\ {cos \: a}^{2} = 1 - 169$

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Answer 2

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