arcsin(cos7/6π)+arcsin(sinπ/6)=
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![arcsin(cos7/6π)+arcsin(sinπ/6)=](/uploads/image/z/8581851-27-1.jpg?t=arcsin%28cos7%2F6%CF%80%29%2Barcsin%28sin%CF%80%2F6%29%3D)
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arcsin(cos7/6π)+arcsin(sinπ/6)=
arcsin(cos7/6π)+arcsin(sinπ/6)=
arcsin(cos7/6π)+arcsin(sinπ/6)=
arcsin(cos7/6π)+arcsin(sinπ/6)
=arcsin(-√3/2)+arcsin(1/2)
=-π/3+π/6
=-π/6