已知sin(X+π/6)=2/3,求sin(X+19π/6)+sin²(π/3-X)的值?
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已知sin(X+π/6)=2/3,求sin(X+19π/6)+sin²(π/3-X)的值?
已知sin(X+π/6)=2/3,求sin(X+19π/6)+sin²(π/3-X)的值?
已知sin(X+π/6)=2/3,求sin(X+19π/6)+sin²(π/3-X)的值?
sin(X+19π/6)+sin²(π/3-X)
=sin(X+3π+π/6)+sin²(π/2-π/6-X)
=sin(X+π+π/6)+cos²(π/6+X)
=-sin(X+π/6)+cos²(π/6+X)
=-2/3+1-sin²(π/6+X)
=1/3-(2/3)²
=1/3-4/9
=-1/9
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