For real values of `theta,` which of the following is/are always positive? `"cos"(costheta)` (b) `cos(sintheta)` `sin(costheta)` (d) `sin(sintheta)`

Question

For real values of `theta,` which of the following is/are always positive? `"cos"(costheta)` (b) `cos(sintheta)` `sin(costheta)` (d) `sin(sintheta)`

For real values of `theta,` which of the following is/are always positive? `"cos"(costheta)` (b) `cos(sintheta)` `sin(costheta)` (d) `sin(sintheta)`
A. `cos(costheta)`
B. `cos(sintheta)`
C. `sin(costheta)`
D. `sin(sintheta)`

Monjur Alahi

7 views

2025-01-04 04:42

1 Answers

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Salim Ahmed Kawsar · Accepted Answer · 2023-02-05T15:29:48+06:00

Salim Ahmed Kawsar

`costheta,sintheta in[-1, 1]` or values lies in 1st or 4th quadrant for which `cos(costheta)" and " cos(sintheta)` are always greater then0. `sin(costheta)lt0," when " costheta in [-1,0)" and "sin(sinthetagt0"only when " sin theta in (0,1]`

7 views Answered 2023-02-05 15:29