Trigonometryhard · Past Paper
If sin theta + cos theta = sqrt(2) cos theta, find the value of cos theta - sin theta.
Asqrt(2) sin theta
Bsqrt(2) cos theta
C2 sin theta
Dsin theta
✓ Correct Answer: A — sqrt(2) sin theta
Squaring both sides of the given equation and the target equation, we can show the value is sqrt(2) sin theta.
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