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secondary 3 | A Maths
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I need help with the qns.
Date Posted: 5 years ago
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For i and ii, draw right angle triangles and use toa cah soh concept
iii, cos(180-A) = -cosA is a fixed formula which is proven by addition formula, recall cos180 = 1, sin180 =0 based on y=sinx and y=cosx graph
iii, cos(180-A) = -cosA is a fixed formula which is proven by addition formula, recall cos180 = 1, sin180 =0 based on y=sinx and y=cosx graph
Date Posted:
5 years ago
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