1 Answer | Add Yours
You need to evaluate `theta` under the given conditions, hence, you should use the following trigonometric identity, such that:
`1 + cot^2 theta = 1/(sin^2 theta)`
You need to replace `1.85 ` for `cot theta` , such that:
`1 + 1.85^2 = 1/(sin^2 theta) => sin^2 theta = 1/4.4225`
`sin^2 theta = 0.226 => sin theta = +-0.475 => theta ~~28^o`
You need to notice that `cot theta` has the positive value `1.85` only if values of `sin theta` and `cos theta` are either both positive, or both negative, hence, `theta` could lie in the quadrants 1 (sine and cosine are both positive) or 3 (sine and cosine are both negative).
`sin theta = +0.475 => theta ~~ 28^o` (quadrant 1)
`sin theta =-0.475 => theta ~~ 208^o` (quadrant 3)
Hence, evaluating the possibl quadrants where `theta` may lie yields that `theta` may lie in quadrant 1 or quadrant 3.
We’ve answered 318,990 questions. We can answer yours, too.Ask a question