求值sin²x+cos²(π/6+x)+1/2sin(2x+π/6)
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求值sin²x+cos²(π/6+x)+1/2sin(2x+π/6)
求值sin²x+cos²(π/6+x)+1/2sin(2x+π/6)
求值sin²x+cos²(π/6+x)+1/2sin(2x+π/6)
sin²x+cos²(π/6+x)+1/2sin(2x+π/6)
=sin²x+1/2+1/2cos(π/3+2x)+1/2sin(2x+π/6)
=sin²x+1/2
=1-1/2cos2x