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I want to know how to determine whether the x or r in cos A = -2/5 is negative so when im using cos A's values in the x^2+y^2=r^2 equation I dont use the wrong number

I want to know how to determine whether the x or r in cos A = -2/5 is negative so when im using cos A's values in the x^2+y^2=r^2 equation I dont use the wrong number
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I want to know how to determine whether the x or r in cos A = -2/5 is negative so when im using cos A's values in the x^2+y^2=r^2 equation I dont use the wrong number

I want to know how to determine whether the x or r in cos A = -2/5 is negative so-example-1
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User J V
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INFORMATION:

STEP BY STEP EXPLANATION:

ANSWER:

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User Jessica Nowak
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