Ex 8.3, 4 If tan A = cot B, prove that A + B = 90 . Given tan A = cot B To solve this we should know relation between tan and cot Now, We know that cot θ = tan (90 - θ) Putting value of cot B tan A = tan (90 - B) Comparing angles A = 90 - B A + B = 90 Hence proved.

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Davneet Singh

Davneet Singh has done his B.Tech from Indian Institute of Technology, Kanpur. He has been teaching from the past 13 years. He provides courses for Maths, Science, Social Science, Physics, Chemistry, Computer Science at Teachoo.

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