Answer
Fill the blanks with
y,$\qquad $x,$\qquad $and$\displaystyle \qquad \frac{y}{x}$
Work Step by Step
See p. 409, Definition of the Trigonometric Functions
Let $P(x, y)$ be the terminal point on the unit circle determined by the real number $t$.
Then for nonzero values of the denominator the trigonometric functions are defined as follows.
$\sin t=y \qquad \cos t=x\qquad \displaystyle \tan t=\frac{y}{x}$
$\displaystyle \csc t=\frac{1}{y}\qquad \displaystyle \sec t=\frac{1}{x}\qquad \displaystyle \cot t=\frac{x}{y}$
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Fill the blanks with
y,$\qquad $x,$\qquad $and$\displaystyle \qquad \frac{y}{x}$
