Mathematics · Trigonometry
If cos(α) = l cos(β) + ml + m cos(β), then the expression [tan(α/2) / tan(β/2)]2 is equal to:
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1l2 - m2l2 + m2
- 2l + ml - m
- 3√(l - ml + m)
- 4l - ml + m✓
Correct answer
l - ml + m
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