1.

If tan α + cot α = 2, then tan20α + cot20α = (a) 0(b) 2(c) 20(d) 220

Answer»

Correct answer is: (b) 2

tan α + cot α = 2 

gives α=45°. So tan α = cot α = 1

tan20α + cot20α = 120 + 120

= 1+1 = 2



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