Write the following expression as a function of a positive acute angle. Use "+" to indicate a positive value and "-" to indicate
2 answers:
Answer:
As property of trigonometric cosine function, we have:
cos(x) = cos(-x)
=> cos(-240) = cos(240)
Otherwise, we also have:
cos(x + 180) = -cos(x)
=> cos(240) = - cos(60)
=> cos(-240) = cos(+240) = -cos(+60)
Hope this helps!
:)
Since the trigonometric functions are periodic, we know that

In this case, you have

Finally, we have

and you can use the formula

To conclude

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Her monthly allowance is $30! hope this helped
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