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Answer:
Exact Form:
c = −
1
2
Decimal Form:
c = −
0.5
Step-by-step explanation:
There exists a trigonometric identity which states that,
sin (A - B) = sin A cos B - cos A sin B
This is very similar to the given expression with A equal to 57° and B equal to 13°. The simplified form of the angle is,
sin (57° - 13°) = sin 44°
You should be able to set up a proportion between the sides something like (18+x)/x=(56+21)/56
Answer:
c
Step-by-step explanation: