Multiple Choice Questions on If cos x cos y 2 the value of sin x sin y is ........ for Mathematics - All Exams Preparation

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Multiple Choice Questions

If cos x cos y 2 the value of sin x sin y is ........

Quantitative Aptitude ( CCS) Trignometry
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    If cos x + cos y = 2, the value of sin x + sin y is

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    Explanation:

    cos x + cos y = 2
    ?  cos x ≤ 1
    ⇒ cos x = 1 ; cos y = 1
    ⇒ x = y = 0°     [? cos 0° = 1]
    ∴  sin x + sin y = 0

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