Verify that sin 2A = 2 tan A/(1 + tan²A), for A = 30°.

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TextTable of Trigonometric Ratios for Standard AnglesPythagorean Trigonometric IdentityCBSE PYQ

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Prove that : tan θ/(1 − cot θ) + cot θ/(1 − tan θ) = 1 + sec θ cosec θ

If a sec θ + b tan θ = m and b sec θ + a tan θ = n, prove that a² + n² = b² + m²

Pythagorean Trigonometric Identity

Identity Relating Secant and Tangent

Use the identity : sin²A + cos²A = 1 to prove that tan²A + 1 = sec²A. Hence, find the value of tan A, when sec A = 5/3, where A is an acute angle.

Prove that : (cos θ – 2 cos³θ)/(sin θ – 2 sin³θ) + cot θ = 0.

Given that sin θ + cos θ = x, prove that sin⁴θ + cos⁴θ = (2 – (x² – 1)²)/2.

If x = cos 30° – sin 30° and y = tan 60° – cot 60°, then