The area under the region bounded by the curve f(r) cos r, the a-ax and the lines x = %3D and a = 2 -- /2 A = Cos x dx A = cos a dr + m/2 cos r dr O Option 1 O Option 2 /2 A Cos x dx A = Cos r dr + Cos r dz OOption 3 Option 4 is

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