Question

arcsin (-√2/2) - arcsin 1/2

Answer 1

$arcsin (- frac{ sqrt{2} }{2}) - arcsin frac{1}{2} =-arcsin frac{ sqrt{2} }{2} - arcsin frac{1}{2} =- frac{ pi }{4}- frac{ pi }{6}=$$=- frac{3 pi }{12} - frac{2 pi }{12}=- frac{5 pi }{12}$