Question

If cot a is 8/15 and sin a 15/17 than cos a =

Answer 1

Answer:

$\cot(a) = \frac{8}{15} \\ \sin(a) = \frac{15}{17} \\ since \: \cot(a) = \frac{ \cos(a) }{ \sin(a) } \\ hence \: \\ \cos(a) = \sin(a) \times \cot(a) \\ \cos(a) = \frac{15}{17} \times \frac{8}{15} \\ = \frac{8}{17}$

Answer 2

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This question has "Introduction to Trigonometry" lesson in 10th class.