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junior college 2 | H2 Maths
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Hi cld i get some help ?thank you !!
Date Posted: 4 years ago
Views: 242
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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
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