Master the Quotient Rule and Trigonometric Identities to Find the Derivative of Sec x

Derivative of sec x

sec x tan x

The derivative of sec x can be found using the quotient rule and trigonometric identities.

Recall that sec x can be written as 1/cos x. Therefore, we have:

(sec x)’ = ((1/cos x))’

Applying the quotient rule:

((1/cos x))’ = (0*cos x – 1*(-sin x))/(cos x)^2

Simplifying:

((1/cos x))’ = -sin x/cos^2 x

Using the identity tan x = sin x/cos x:

((1/cos x))’ = -tan x/sec^2 x

Therefore, the derivative of sec x is -tan x/sec^2 x.

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