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How to solve the problem of integral angle of trigonometric function of liberal arts in senior three?
Expand sin(a+pi/3), then merge the sina terms, and then divide both sides of the equation by the root number 3, and it becomes

1/2 root number 3 Sina+1/2 Xhosa =-4/5,

Sina 2/3pi Sina-cos 2/3pi cosa =-4/5，

cos(a+2/3pi)=4/5

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