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in Trigonometry by (45 points)
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tan230° sin30° + cos60° sin290° tan260° - 2tan45° cos20° sin90°

\(\Big(\frac{1}{\sqrt{3}}\Big)^2\times\frac{1}{2}\) + \(\frac{1}{2}\) x 12 x (√3)2 - 2 x 1 x 12 x 1

(By putting the trigonometric function values)

\(\frac{1}{6}+\frac{3}{2}\) - 2

\(\frac{1+9-12}{6}\) = \(\frac{-2}{6}=\frac{-1}{3}\)

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