Trigonometryhard · Past Paper
Find the value of cos²θ(1 + tan²θ).
A1
Bsin²θ
Ccos²θ
D0
✓ Correct Answer: A — 1
cos²θ * sec²θ = 1.
Share this question
More from Trigonometry
- If the elevation of sun changes from 30 to 60, the shadow of a tower decreases by 10 m. Height?
- If sin(A+B) = 1 and cos(A-B) = √3/2, find A and B.
- If 7 sin^2 theta + 3 cos^2 theta = 4, then tan theta is:
- The value of cos² A + cos²(60+A) + cos²(60-A) is:
- A person standing on the bank of a river observes the angle of elevation of a tree on the opposite bank as 60°. When he moves 40 m away, it becomes 30°. Width of river?