What is the value of cos(x) if tan ( x)= -2 and x is in quadrant of IV?
1 answer:
Answer:

Step-by-step explanation:
we have that

The angle x is in quadrant IV
That means ---> The value of cos(x) is positive and the value of sin(x) is negative
Remember that
----> equation A

so

----> equation B
substitute equation B in equation A
solve for cos(x)

square root both sides

but remember that the value of cos(x) is positive (IV quadrant)

simplify

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