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Writing tan x as sin x over cos x, the quotient rule yields
Asec x tan x
Bsec^2 x
C-cosec^2 x
Dcos^2 x
Answer & Solution
Correct answer: B. sec^2 x
The quotient rule gives (cos^2 x + sin^2 x)/cos^2 x, which is sec^2 x.
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