The area, enclosed by the curves y = sin x + cos x and y = | cos x - sin x | and the lines x = 0 ,   x…

The area, enclosed by the curves y=sinx+cosx and y=|cosx-sinx| and the lines x=0, x=π2, is :
  1. 22(2+1)
  2. 22(2-1)
  3. 4(2-1)
  4. 2(2+1)

Solution

A=0π/2((cosx+sinx)-|cosx-sinx|)dx

A=0π/4((cosx+sinx)-(cosx-sinx))dx+π/4π/2((cosx+sinx)-(sinx-cosx))dx

A=20π/4sinxdx+2π/4π/2cosxdx

=2-12+1+21-12=4-22=22(2-1)

Asked in: JEE Main 2021 (01 Sep Shift 2)

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