Please \sin(120) \\ \tan( (3\pi)/(4) ) help me I need help​

Question

Please

`\sin(120) \\ \tan( (3\pi)/(4) )`
help me I need help​

Answer 1

`\\ \rm\longmapsto sin120`

`\\ \rm\longmapsto sin(90+30)`

`\\ \rm\longmapsto cos30`

`\\ \rm\longmapsto (√(3))/(2)`

Now

`\\ \rm\longmapsto tan\left((2\pi)/(4)\right)`

`\\ \rm\longmapsto tan135`

`\\ \rm\longmapsto -1`

Answer 2

`\sin(120) \\ = \sin(90 + 30) \\ = \cos(30) \\ = ( √(3) )/(2) \\ \\ \tan( (3\pi)/(4) ) \\ = \tan(135) \\ = \tan(90 + 45) \\ = - \cot(45) \\ = - 1`