Question
Solution
sec θ = a/b = H/B By PGT perpendicular = √a2 – b2 = 1 – tan2 θ / 2 – sin2 θ = 1 – (a2 – b2) / b2 / 2 – (a2 – b2) / a2 = (b2 – a2 + b2) a2 / b2 ( 2a2 – a2 + b2) = a2 (2b2 –a2) / b2 (a2 + b2)
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