The identity sin-1 x + cos-1 x = π/2 Figure 1.72 establishes the identity for 0
The identity sin-1x + cos-1 x = π/2 Figure 1.72 establishes the identity for 0 x = 1, 0, and –1.Then, for values of xin ( -1, 0) , let x = –a, a>0 and apply Eqs. (3) and (5) to the sum sin-1( -a)+ cos-1(-a) .
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