1 Answer

Muthu R · Answer 1 · 2023-10-26T15:34:09+0000

Explanation:

The unit circle is a circle in the form of

${x}^(2) + {y}^(2) = 1$

while x = cos t

y= sin t

, where t is an angle

So we plug in -1/7, for x to find y

$( ( - 1)/(7) ) {}^(2) + {y}^(2) = 1$

${y}^(2) = (49)/(49) - (1)/(49)$

y = (4 √(3) )/(7)

If the point is in the 2nd quadrant, your value of y is positive

If it in the third quadrant, the y value is negative

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