Trigonometrymedium · Past Paper
If sin θ = x/y, then cos θ is equal to:
Asqrt(y²-x²)/y
Bsqrt(x²+y²)/y
Cy/sqrt(y²-x²)
Dx/sqrt(y²-x²)
✓ Correct Answer: A — sqrt(y²-x²)/y
p=x, h=y. b = sqrt(h²-p²) = sqrt(y²-x²). cos θ = b/h.
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