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1. If [itex]x = \cos \theta[/itex] and [itex]y = \cos \theta + \sin \theta[/itex], [itex]\frac{dy}{dx}[/itex] is? (Answer: [itex]1 - \cot \theta[/itex])

I'm just not seeing this question... any help appreciated.

2. [itex]y = \ln(\sec 2x + \tan 2x)[/itex] (Answer = [itex]2\sec 2x[/itex])

I get to [tex]\frac{1}{(2\sec x\tan x) + (2\sec^2 x)}[/tex] but it doesn't seem that I'm on the right track compared to the answers I have.

I'm just not seeing this question... any help appreciated.

2. [itex]y = \ln(\sec 2x + \tan 2x)[/itex] (Answer = [itex]2\sec 2x[/itex])

I get to [tex]\frac{1}{(2\sec x\tan x) + (2\sec^2 x)}[/tex] but it doesn't seem that I'm on the right track compared to the answers I have.

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