If cosA=0.7? What is A
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Answer:
Explanation: Take the inverse cosine of both sides of the equation to extract A from inside the cosine.
A = arccos ( 0.7 )
Evaluate
arccos ( 0.7 ) . A
= 0.79539883
The cosine function is positive in the first and fourth quadrants. To find the second solution, subtract the reference angle from
2π
to find the solution in the fourth quadrant.
A= 2 ( 3.14159265 ) − 0.79539883
Simplify
2 ( 3.14159265 ) − 0.79539883
A = 5.48778647
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