Quantitative Aptitude Trigonometry Circular Measure of Angles

Let PQR be a right angled triangle, right-angled at R. Let PQ = 29 cm, QR = 21 cm and ∠Q = θ. Find the value of cos2 θ – sin2 θ.

1
\(\frac{41}{841}\)
2
\(\frac{841}{41}\)
3
\(\frac{840}{40}\)
4
\(\frac{40}{840}\)

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