Let \cos \\theta+\cos \\beta=2 and \sin \\theta+\sin \\beta=0, where 0 \\leq \\alpha \\leq 90^\circ, 0 \\leq \\beta \\leq 90^\circ What is the value of (\cos 2 \\alpha-\cos 2 \\beta) ?

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UPSC CDS 1 2021 Math Paper

Question : 85 of 100

Marks: +1, -0

Let cos‌θ+cos‌β=2 and sin‌θ+sin‌β=0, where 0≤α≤90°,0≤β≤90° What is the value of (cos‌2‌α−cos‌2‌β) ?

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