Mathematics · Trigonometry
Which of the following identities is correct, given that none of the angles x, y, and (x + y) is a multiple of π?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1cot(x + y) = 1 - cot x cot ycot y + cot x
- 2cot(x + y) = cot x cot y - 1cot y + cot x✓
- 3tan(x + y) = 1 - tan x tan ytan x + tan y
- 4tan(x + y) = tan x - tan y1 + tan x tan y
Correct answer
cot(x + y) = cot x cot y - 1cot y + cot x
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