Eric Nicholas K's answer to Ong Jia Zhi's Secondary 3 A Maths Singapore question.
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You can use either double-angle formula followed by R-formula to get the answer or my method below.
EDIT (for the one on top): Change '-3 cos x' to '-3 cos 2x'.
EDIT (for the one on top): Change '-3 cos x' to '-3 cos 2x'.
Date Posted:
5 years ago
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