Question

cos48°cos42°-sin48°sin42°​

Answer 1

Answer:

value of Cos 48 course 42 - sin 48 sin 42 is 1

Step-by-step explanation:

we use the identities given in exercise 8.3 or 4

Answer 2

Answer:

0

Step-by-step explanation:

Cos 48°cos 42° – Sin 48° Sin 42°

=Cos (90° – 48°) Cos (90°-42°) – Sin 48° Sin 42°

=Sin 42° Sin 48° – Sin 48° Sin 42°

=0

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