mayurimjani
mayurimjani
25-06-2016
Mathematics
contestada
evaluate: sin (225degree)
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olemakpadu
olemakpadu
26-06-2016
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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