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Inverse circular functions,Principal values of $sin_{−1}x,cos_{−1}x,tan_{−1}x$. $tan_{−1}x+tan_{−1}y=tan_{−1}1−xyx+y $, $xy<1$ $π+tan_{−1}1−xyx+y $, $xy>1$. Evaluate the following : (a) $sin[3π −sin_{−1}(−21 ) ]$ (b) $sin[2π −sin_{−1}(−23 ) ]$