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Let P Q R PQR PQR be a right-angled triangle, right-angled at R R R . Given P Q = 29 cm PQ = 29 \text{ cm} PQ = 29 cm , Q R = 21 cm QR = 21 \text{ cm}...

SSC SSC CGL Tier 2 Easy Trigonometric Ratios MCQ

Question

Let PQRPQR be a right-angled triangle, right-angled at RR. Given PQ=29 cmPQ = 29 \text{ cm}, QR=21 cmQR = 21 \text{ cm}, and ∠Q=θ\angle Q = \theta. Find the value of cos⁡2θ−sin⁡2θ\cos^2 \theta - \sin^2 \theta.

Options

A.

41841\frac{41}{841}

B.

84141\frac{841}{41}

C.

84040\frac{840}{40}

D.

40840\frac{40}{840}

right-angled trianglepythagoras theoremtrigonometric ratioscosinesinetrigonometric identities

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