Mathematics · Trigonometry
If tan A = a tan B and sin A = b sin B, then the value of cos2A is:
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1a2 - 1b2 - 1✓
- 2b2 + 1a2 + 1
- 3a2 + 1b2 + 1
- 4b2 - 1a2 - 1
Correct answer
a2 - 1b2 - 1
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