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Question 75 of 90
The value of - π / 2 π / 2 p   sin 3 x + q sin 4 x + r   sin 5 x   d x depends on :
1. p
2. q
3. r
4. p and q

Dear Student,
Please find below the solution to the asked query:

We know that-aafx.dx=0if fx is odd20afx.dxif fx is even...iNow-π2π2 psin3x+qsin4x+rsin5xdx=-π2π2psin3x+rsin5x.dx+-π2π2 qsin4x.dxHence using i we getI=0+20π2 qsin4x.dx=20π2 qsin4x.dxHence option2 is correct.

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