Question

If sin(x-20) ° =cos(3x-10) ° , then x is :


(A) 60 (B) 30 (C) 45 (D) 35.5

Answer 1

Ans: option (B)

step by step explanation:

sin ( x - 20) = cos (3x - 10)

cos [ 90 - (x - 20)] = cos ( 3x - 10)

90 - x + 20 = 3x - 10

90 + 30. = 3x + x

120 = 4x

x = 120/4 = 30

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Answer 2

answer is

D) 30

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