已知sin(x+π )=—1/2,计算:sin(5π —x)—cos(x—3π /2)

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已知sin(x+π)=—1/2,计算:sin(5π—x)—cos(x—3π/2)已知sin(x+π)=—1/2,计算:sin(5π—x)—cos(x—3π/2)已知sin(x+π)=—1/2,计算:s

已知sin(x+π )=—1/2,计算:sin(5π —x)—cos(x—3π /2)
已知sin(x+π )=—1/2,计算:sin(5π —x)—cos(x—3π /2)

已知sin(x+π )=—1/2,计算:sin(5π —x)—cos(x—3π /2)
sin(x+π )=—1/2 得sinx=1/2 得sin(5π —x)—cos(x—3π /2) =sinx+sinx=2sinx=1