railway RRB Technician Grade 3 Mock Test 2024 Quantitative Aptitude Trigonometry Trigonometric Ratios and Identities

If x = a sec θ + b tan θ and y = a tan θ + b sec θ, then find x2 – y2.

1
a + b
2
a2 – b2
3
\(\sqrt {{a^2} + {b^2}}\)
4
a2 + b2
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