Tan Y J's answer to Anika's Junior College 2 H2 Maths Singapore question.
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(1-sin^2(2x))cos3x
By small angle approximation,
=(1-(2x) ^2)(1- (3x)^2/2!)
=(1-4x^2)(1-9/2 x^2)
=1-4.5x^2-4x^2+18x^4
=1-8.5x^2
Replace the equal sign with curly sign for the first and last line of workings
By small angle approximation,
=(1-(2x) ^2)(1- (3x)^2/2!)
=(1-4x^2)(1-9/2 x^2)
=1-4.5x^2-4x^2+18x^4
=1-8.5x^2
Replace the equal sign with curly sign for the first and last line of workings
Date Posted:
4 years ago
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