It is given that . What is the value of ?
Answer and explanation
Correct answer: D.
- Step 1: Square both sides: .
- Step 2: Since , we get .
- Step 3: So and .
Answer
.
Why not the others: is the value of ; has the wrong sign; is ; halves twice.
Practise more Trigonometry.
Free questions with an explanation for every one, and full timed TMUA mock tests.
More Trigonometry questions
- The angle is acute and . What is the value of , where ?
- How many solutions does have in the interval ?
- How many solutions does have in the interval ?
- What is the minimum value of for real ?
- It is given that and is acute. What is ?
- A triangle has two sides of lengths and with an angle of between them. What is its area?