New RBI Grade B 2025 Notification will come Soon! Enroll Here

    Question

    If 17sin A = 8, where

    0
    A 5/3 Correct Answer Incorrect Answer
    B 1/4 Correct Answer Incorrect Answer
    C 4 Correct Answer Incorrect Answer
    D 3/5 Correct Answer Incorrect Answer

    Solution

    17sin A = 8

    Or, sin A = (8/17)

    Using sin 2  A + cos 2  A = 1

    cos 2  A = 1 - sin 2  A

    Or, cos 2  A = 1 - (8/17)  2

    Or, cos 2  A = 1 - (64/289)

    Or, cos A = (225/289)

    Or, cos A = (15/17) Image

    But 0

    Practice Next