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23 January, 23:45

Evaluate: sin (225degree)

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  1. 24 January, 00:03
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    Sin (225)

    225 degrees is in the 3rd quadrant. And in the third quadrant only tangent is positive, sin is negative.

    For third quadrant, basic angle = 225 - 180 = 45

    sin225 = - sin45

    sin225 = - sin45 = - 0.7071

    sin 225° ≈ - 0.7071
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