Bryan Chong's answer to serendipity's Secondary 4 A Maths Singapore question.
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Sorry the btm got cut off. Last line is deriving expressions of cosA & sinA with the newfound value of the hypothenuse of the "triangle" with basic angle A.
sinA = -5/13 as A lies in the 4th quadrant
cosA = 12/13 (Adj/Hyp)
sinA = -5/13 as A lies in the 4th quadrant
cosA = 12/13 (Adj/Hyp)
Date Posted:
3 years ago
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