Calculus Examples

$lim_{x \to π} \cos (x)$

Step 1

Move the limit inside the trig function because cosine is continuous.

$\cos (lim_{x \to π} x)$

Step 2

Evaluate the limit of $x$ by plugging in $π$ for $x$ .

$\cos (π)$

Step 3

Simplify the answer.

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Step 3.1

Apply the reference angle by finding the angle with equivalent trig values in the first quadrant. Make the expression negative because cosine is negative in the second quadrant.

$- \cos (0)$

Step 3.2

The exact value of $\cos (0)$ is $1$ .

$- 1 \cdot 1$

Step 3.3

Multiply $- 1$ by $1$ .

$- 1$