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- Thread starter dec1ble
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Tide

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HallsofIvy

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sin x+ (tan x/(1+ cos x), or (-sin x+ tan x)/(1+ cos x) or...

Probably you mean (sin x+ tan x)/(1+ cos x)= tan x.

Hint: replace tan x by sin x/cos x. Then do the algebra to simplify the left side.

(1+ cos x is important!)

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