Multiple Choice Questions on If Delta ABC is right angles at C then what is cos A B sin A B equal to ........ for Mathematics - All Exams Preparation

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Multiple Choice Questions

If Delta ABC is right angles at C then what is cos A B sin A B equal to ........

Quantitative Aptitude ( CCS) Trignometry
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    If ΔABC is right angles at C, then what is cos(A + B) + sin(A + B) equal to?

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    Explanation:

    In ΔABC, ∠C is right angled
    Then,
    ∠A + ∠B + ∠C = 180°
    ∠A + ∠B = 180° – 90° = 90°
    cos (A + B) + sin (A + B)
    = cos 90° + sin 90°
    = 0 + 1 = 1.

    By: Amit Kumar
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