Mathematics · Trigonometry
The expression cos4A - sin4A is equal to which of the following?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 12cos2A + 1
- 21 - 2sin2A✓
- 32sin2A - 1
- 4-(2sin2A + 1)
Correct answer
1 - 2sin2A
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