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Introduction to Trigonometry
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13/06/2021 11:48 am
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If tan A = cot B, prove that A + B = 90°.
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13/06/2021 11:49 am
tan A = cot B
We know that cot B = tan (90° – B)
To prove A + B = 90°, substitute the above equation in the given problem
tan A = tan (90° – B)
A = 90° – B
A + B = 90°