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Trigonometrical Ratios of (90° + θ)
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Trigonometry - Physics For Ethiopian Science Society
Sin(90-A), Sin(90+A), Cos(180-A), Cos(180+A), Sin(270-A), Sin(270+
2.9 Trigonometry - Materials-2 - sin α = cos (90°- α) =yr cos α = sin (90°- α) =xr tan α - Studocu
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Elements of plane and spherical trigonometry . , and esc negative,and tan and cot positive. In the fourth quadrant x is positive and y is negative.Hence in this quadrant the negative
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