1)cos60°-[tex]\sqrt{6}[/tex]·cos30°·sin45°+ctg30°·tg150°-tg45°
2)sin[tex]\frac{\pi }{6}[/tex]+√2·cos[tex]\frac{3\pi }{4}[/tex]-√3·ctg[tex]\frac{\pi }{3}[/tex]
3)sin([tex]\pi[/tex]-[tex]\alpha[/tex])+cos([tex]3\pi +\alpha[/tex])+sin([tex]-\alpha[/tex])+cos([tex]-\alpha[/tex])
4)[tex](cos^{2} \alpha -sin^{2}\alpha )^{2} +4sin^{2} \alpha[/tex]·[tex]cos^{2} \alpha[/tex]
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