Question

Sec a=29/21.evaluate sin a-1/tan a​

Answer 1

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We know that 20, 21, 29 are Pythagorean Triplets.

So if sec A = 29/21, then from trigonometry we can say,

sin A = 20/29

tan A = 20/21

Substituting the values,

= ((20/29) - 1 ) / (20/21)

= (-9/29) / (20/21)