If a cos-b sin-m and a sin-b cos-n- then a2-b2-a m2-n2b m2 n2c n2-m2d m2-n2

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Calculating Heights and Distances

If a cosθ+b s...

Question

If a cos θ + b sin θ = m and a sin θ − b cos θ = n, then a² + b² =

(a) m² − n²
(b) m²n²
(c) n² − m²
(d) m² + n²

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