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CBSE Class 12-science Answered

How to integrate (3sinx-2)cosx divide by (9+16sin2x)?
Asked by sasikala106 | 20 Mar, 2018, 10:55: AM
answered-by-expert Expert Answer
begin mathsize 16px style straight I equals integral fraction numerator left parenthesis 3 sinx minus 2 right parenthesis cosxdx over denominator 9 plus 16 sin squared straight x end fraction
Put space sinx equals straight t
cosxdx equals dt
straight I equals integral fraction numerator open parentheses 3 straight t minus 2 close parentheses begin display style dt end style over denominator 9 plus 16 straight t squared end fraction
straight I equals integral open parentheses fraction numerator 3 straight t over denominator 9 plus 16 straight t squared end fraction minus fraction numerator 2 over denominator 9 plus 16 straight t squared end fraction close parentheses dt
straight I equals integral open square brackets 3 over 32 cross times fraction numerator 32 straight t over denominator 9 plus 16 straight t squared end fraction minus 2 open parentheses fraction numerator 1 over denominator 9 plus 16 straight t squared end fraction close parentheses close square brackets dt
straight I equals fraction numerator begin display style 3 end style over denominator begin display style 32 end style end fraction cross times log open vertical bar 9 plus 16 straight t squared close vertical bar minus 2 cross times 1 third cross times 1 fourth tan to the power of negative 1 end exponent open parentheses fraction numerator 4 straight t over denominator 3 end fraction close parentheses plus straight c
straight I equals fraction numerator begin display style 3 end style over denominator begin display style 32 end style end fraction cross times log open vertical bar 9 plus 16 sin squared straight x close vertical bar minus 1 over 6 tan to the power of negative 1 end exponent open parentheses fraction numerator 4 sinx over denominator 3 end fraction close parentheses plus straight c
end style
Answered by Sneha shidid | 21 Mar, 2018, 09:22: AM
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integral fraction numerator sin x times cos x over denominator square root of 1 plus sin squared end root x end fraction d x
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