Bryant Lam Hong Sheng's answer to Yos's Secondary 4 E Maths Singapore question.
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(a) Reflex angle means the angle is more than 180 but less than 360 degrees. Hence, for cos x to be positive, x has to lie between 270 and 360 degrees.
(b) For tan y to be negative, y has to lie between 270 and 360 degrees.
(b) For tan y to be negative, y has to lie between 270 and 360 degrees.
Date Posted:
4 years ago
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