Mathematics · Trigonometry
The trigonometric expression cos2θ - 1, where 0° < θ < 90°, is equal to which of the following?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1-sec2θ
- 2sec2θ
- 3-sin2θ✓
- 4cos2θ
Correct answer
-sin2θ
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