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The Cast diagram helps us to remember the signs of the trigonometric functions in each of the quadrants.

The CAST diagram is also called the Quadrant Rule or the ASTC diagram.

In the first quadrant, the values are all positive.

In the second quadrant, only the values for sin are positive.

In the third quadrant, only the values for tan are positive.

In the fourth quadrant, only the values for cos are positive.

Note that the mnemonic CAST goes anticlockwise starting from the 4th quadrant.

Quadrant Rule or CAST diagram

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