Question

Please " id="TexFormula1" title=" \sin(120) \\ \tan( \frac{3\pi}{4} ) " alt=" \sin(120) \\ \tan( \frac{3\pi}{4} ) " align="absmiddle" class="latex-formula">
help me I need help​

Answer 1

Answer:

$\sin(120) \\ = \sin(90 + 30) \\ = \cos(30) \\ = \frac{ \sqrt{3} }{2} \\ \\ \tan( \frac{3\pi}{4} ) \\ = \tan(135) \\ = \tan(90 + 45) \\ = - \cot(45) \\ = - 1$

Answer 2

$\\ \rm\longmapsto sin120$

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

$\\ \rm\longmapsto cos30$

$\\ \rm\longmapsto \dfrac{\sqrt{3}}{2}$

Now

$\\ \rm\longmapsto tan\left(\dfrac{2\pi}{4}\right)$

$\\ \rm\longmapsto tan135$

$\\ \rm\longmapsto -1$