Question

Help me please sssssssssssssssssssssssssssss

Answer 1

I don’t understand the language where the problem is.

Answer 2

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  `-(1)/(2)+(√(3))/(3)`

Explanation:

`\sin \left(30^(\circ \:)\right)+\cos \left(60^(\circ \:)\right)-1\\\\\mathrm{Use\:the\:following\:trivial\:identity}:\\\quad \sin \left(30^(\circ \:)\right)=(1)/(2)\\\\\mathrm{Use\:the\:following\:trivial\:\\identity}:\\\quad \cos \left(60^(\circ \:)\right)=(1)/(2)\\\\=(1)/(2)+(1)/(2)-1\\\\=0`

`\\\cos \left(60^(\circ \:)\right)+\tan \left(30^(\circ \:)\right)-1\\\\\mathrm{Use\:the\:following\:trivial\:identity}:\\\quad \cos \left(60^(\circ \:)\right)=(1)/(2)\\\mathrm{Use\:the\:following\:trivial\:identity}:\\\quad \tan \left(30^(\circ \:)\right)=(√(3))/(3)\\\\=(1)/(2)+(√(3))/(3)-1\\\\=-(1)/(2)+(√(3))/(3)`