Q1 of 46 Page 288

Evaluate

A)

By trigonometric identity, we have


tan (90° - θ) = cot θ


Replace θ = 54°


⇒ tan (90° - 54°) = cot 54°


⇒ tan 36° = cot 54° [∵, 90° - 54° = 36°]


Now,


⇒


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