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Asked by al

find all critical numbers of the function f (θ) = 2secθ +tanθ when -14<θ -12
4 years ago

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Answered by oobleck
f'(θ) = 2secθ tanθ + sec^2θ
= (2sinθ + 1)/cos^2θ
So where is f'(θ) zero or undefined?

clearly at θ = odd multiples of π/2, since cosθ=0
where else?
4 years ago
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find all critical numbers of the function f (θ) = 2secθ +tanθ when -14<θ -12

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