Write the expression as the sine, cosine, or tangent of an angle. cos 107° cos 42° + sin 107° sin 42°

It will be

Step-by-step explanation:

Since we have given that

cos 107° cos 42° + sin 107° sin 42°

As we know the formula :

So, applying the above formula , we get

Now, we have to write it in cosine terms,

So, we get,

So, in terms of cosine , it will be

In terms of sine , it will be

Hence, it will be