What is the best way to solve the question of introduction of trigonometry of class 10 ncert , how i solve this question easily and fastly give me the best solution of this question no.4 of exercise 8.3 .If tan A = cot B, prove that A + B = 90°
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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°
Hence Proved.