Cos 48 degree + sin 42 degree
Answers
Answered by
0
Step-by-step explanation:
cos48+sin42
sin(90-48)+sin42
sin 42 + sin 42
2sin42
Answered by
1
Step-by-step explanation:
cos48° + sin42°
= cos (60-12)° + sin(30 + 12)
= (cos60°cos12° - sin60°sin12°) + (sin30°cos12° + cos30°sin12°)
=[(cos12° / 2 ) - (√3 sin12° /2)] +[(cos12°/2) + (√3sin12°/2)]
= 2[ (cos 12°)/2]
= cos 12°
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