Evaluate , where .

Answer and explanation

Correct answer: D.

  1. Step 1: Express : .
  2. Step 2: Rewrite .
  3. Step 3: Evaluate: .
Answer
.
Why not the others: '' multiplies by 8; '' computes with instead of ; '' treats as .

Practise more Trigonometry, Vectors and Complex Numbers.

Free questions with an explanation for every one, and full timed EmSAT Achieve (UAE) mock tests.

All Trigonometry, Vectors and Complex Numbers questionsTake a mock test

More Trigonometry, Vectors and Complex Numbers questions