Find f sin 2 x/ 9 - cos4 x dx
This question is similar to Example 42 - Chapter 7 Class 12 - Integrals


CBSE Class 12 Sample Paper for 2022 Boards (For Term 2)
CBSE Class 12 Sample Paper for 2022 Boards (For Term 2)
Last updated at Dec. 14, 2024 by Teachoo
This question is similar to Example 42 - Chapter 7 Class 12 - Integrals
Transcript
Question 1 β Choice 2 Find β«1βγsinβ‘2π₯/β(9 β cos^4β‘π₯ ) ππ₯γNow, β«1βγsinβ‘2π₯/β(9 β cos^4β‘π₯ ) ππ₯γ=β«1βγ(π π¬π’π§β‘π ππ¨π¬β‘π)/β(π β(γπππγ^πβ‘π )^π ) π πγ Let γπππγ^πβ‘π=π Differentiating both sides w.r.t.π₯ 2 cosβ‘π₯ Γ βsinβ‘π₯=ππ‘/ππ₯ π π=π π/(βπ πππβ‘π πππβ‘π ) Hence, our equation becomes β«1βγ(π π¬π’π§β‘π ππ¨π¬β‘π)/β(π β(γπππγ^πβ‘π )^π ) π πγ =β«1βγ(2 sinβ‘π₯ cosβ‘π₯)/β(9 β π‘^2 ) ππ₯γ =β«1βγ(2 sinβ‘π₯ cosβ‘π₯)/β(9 β π‘^2 )Γπ π/(βπ πππβ‘π πππβ‘π )γ =ββ«1βππ‘/β((3)^2 β (π‘)^2 ) =β[sin^(β1)β‘γπ‘/3+πΆ1γ ] =βπππ^(βπ) π/π+πͺ It is of form β«1βγπ π/β(π^π β π^π )=πππ^(βπ) π/π+πͺγ Replacing π₯ by π‘ and π by 3, we get Putting back π=γπππγ^πβ‘π =βπππ^(βπ) [π/π πππ^π π]+πͺ