Q13 of 42 Page 193

Prove that:

Rationalizing we get,







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11

12

Evaluate

14

cot θ . tan (90 – θ) – sec (90–θ) . cosec θ + sin2 35 + sin2 55 + √3 . tan 5. tan 15 . tan 30 . tan 75 . tan 85

 15

If , Find the value of