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Inverse Trigonometric Functions · Question 112 of 120

Question 112

HardOriginal question

What is the value of sin⁡(π3−sin⁡−1(−12))\sin\left(\frac{\pi}{3} - \sin^{-1}\left(-\frac{1}{2}\right)\right)?

Options for question 112

Show the answer and explanation
CorrectNot quiteAnswer D

Correct answer: D

Explanation

  1. sin⁡−1(−12)=−π6\sin^{-1}\left(-\frac{1}{2}\right) = -\frac{\pi}{6}, so the angle is π3+π6=π2\frac{\pi}{3} + \frac{\pi}{6} = \frac{\pi}{2}.

  2. sin⁡π2=1\sin \frac{\pi}{2} = 1.

Worth noting

12\frac{1}{2} is sin⁡π6\sin\frac{\pi}{6}, from subtracting π6\frac{\pi}{6} where the minus sign turns it into an addition.

Concept
A function of a principal value
Typical time
120 s
Your time
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The rule this testsValues of expressions
Practise this chapter →

Ten questions from Inverse Trigonometric Functions, at your own pace.

Practise this chapter →

Ten questions from Inverse Trigonometric Functions, at your own pace.