Take the integral as I
take cos3x as the first function and apply integration by parts , simplify and then apply integration by parts to the integral obtained in the first answer.
Simplify to get the original integral I in the right hand side and change it to I
Solve for I from this equation
formulae on integration
PAGE 1 BASIC INTEGRATION
PAGE 2 INTEGRATION BY SUBSTITUTION
PAGE 3 INTEGRATION BY COMPLETION OF SQUARES
PAGE 4 INTEGRATION BY PARTS
PAGE 5 INTEGRATION BY MANIPULATION OF NUMERATOR IN TERMS OF DENOMINATOR
PAGE 6 INTEGRATION USING PARTIAL FRACTIONS
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