This question is from trigonometry topic -trigonometric ratios on complementary angles in which we have been asked to find the value of A, if tan2A = cot(A-12°)
RS Aggarwal, Class 10, chapter 12, question no 13
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tan2A=cot(A−12°) (given)
⇒cot(90°−2A)=cot(A−12°)
⇒(90°−2A)=(A−12°)
⇒A+2A=90°+12°
⇒A=34°