Question

Trigonometry that’s due in one hour :(

Answer 1

(a)
`\theta=\tan^(-1)(-0.890)`

`\implies \theta=-41.66908262 \pm 180 \textdegree n`

`\implies \theta=138.3309174..., 318.3309174...`

`\implies \theta=138\textdegree, 318\textdegree`

(b)
`\theta=\cos^(-1)\left((√(3) )/(2)\right)`

`\implies \theta=30 \textdegree \pm360 \textdegree n, 330 \textdegree \pm360 \textdegree n`

`\implies \theta=30 \textdegree , 330 \textdegree`

(c)
`\theta=\sin^(-1)\left((1 )/(2)\right)`

`\implies \theta=30 \textdegree \pm360 \textdegree n, 150 \textdegree \pm360 \textdegree n`

`\implies \theta=30 \textdegree , 150 \textdegree`