Find the value of cos 42° cos 12° + sin 42° sin 12°
Answers
Answered by
1
Step-by-step explanation:
Use formula cosa cosb +sina sinb=cos(a-b)
Here a=42, b=12
We get cos(42-12)=cos30degree
=1.732/2
Answered by
0
Answer:
= cos (42° -12°)
=cos (30°)
=√3/2.
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