2012 · Q51
If the angle theta is in the first quadrant and tan theta = 3, then what is the value of (sin theta + cos theta)?
Elementary MathematicsTrigonometry
- A1/sqrt(10)
- B2/sqrt(10)
- C3/sqrt(10)
- D4/sqrt(10)
Explanation
sin theta = 3/sqrt(10), cos theta = 1/sqrt(10), so their sum is 4/sqrt(10).