Step 1: Try Option 1: Plug It In
Step 2: Identify the Cosine Limit Identity format.
OR
Step 3: Get the outside the cosine function to match the inside the cosine function. Rewrite the equation to collect the Cosine Limit Identity pieces that now match. You want to think about this process in a similar way to finding a common denominator. You can’t multiply inside your cosine function. So, you need to multiply the outside to get the two pieces to match.
Step 4: Apply the Cosine Limit Identity and Option 1: Plug It In to solve the limit