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15 July, 16:50

Find the exact value of sin (2

a. if cos a = 3 / 5. assume a is a quadrant i angle in standard position.

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  1. 15 July, 17:14
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    In a right angled triangle 'efg' cos a = 3/5

    From Pythagoras theorem the third side will be 4

    cos a = 3/5

    sin a = 4/5

    sin 2a = 2 x 4/5

    sin 2a = 8/5
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