Find the area of the figure bounded by three curves
C_1: y\equal{}\sin x\ \left(0\leq x<\frac {\pi}{2}\right)
C_2: y\equal{}\cos x\ \left(0\leq x<\frac {\pi}{2}\right)
C_3: y\equal{}\tan x\ \left(0\leq x<\frac {\pi}{2}\right).
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