cos(A-30)+sinA=4(√3)/5,求sin(A+210)如题.....
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cos(A-30)+sinA=4(√3)/5,求sin(A+210)如题.....
cos(A-30)+sinA=4(√3)/5,求sin(A+210)
如题.....
cos(A-30)+sinA=4(√3)/5,求sin(A+210)如题.....
cos(A-30)+sinA=4(√3)/5
cosAcos30+sinAsin30=4(√3)/5
[(√3)/2]cosA+(3/2)sinA=4(√3)/5
(1/2)cosA+[(√3)/2]sinA=4/5
sin30cosA+cos30sinA=4/5
sin(30+A)=4/5
sin(30+A+180)=-4/5
sin(A+210)=-4/5
求证:sin²A+cos²(A+30)+sinA*cos(A+30)=3/4
cos(A-30)+sinA=4(√3)/5,求sin(A+210)如题.....
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