Вычислите:а)2 sin [latex]60^{0} [/latex] + ctg ([latex] -\frac{\pi }{6} [/latex])б)cos [latex] \frac{7 \pi }{4} [/latex]+tg [latex]540 ^{0} [/latex]

[latex]2sin60^0+ctg (-\frac{\pi }{6})=2sin60^0-ctg\frac{\pi }{6}=2* \frac{ \sqrt{3} }{2}- \sqrt{3}=0[/latex] [latex]cos \frac{7 \pi }{4} +tg540^0=cos( \pi + \frac{3 \pi }{4})+tg4 \pi [/latex] = [latex]-cos\frac{3 \pi }{4}+tg4 \pi=-(- \frac{ \sqrt{2} }{2})+0= \frac{ \sqrt{2} }{2} [/latex]