Plot of Sine
The Sine Function has this beautiful up-down curve (which repeats every 2πradians, or 360°).
It starts at 0, heads up to 1by π/2 radians (90°) and then heads down to -1.
Plot of Cosine
Cosine is just like Sine, but it starts at 1 and heads down until π radians (180°) and then heads up again.
Plot of Sine and Cosine
In fact Sine and Cosine are like good friends: they follow each other, exactly "π/2" radians, or 90°, apart.
Plot of the Tangent Function
The Tangent function has a completely different shape ... it goes between negative and positive Infinity, crossing through 0 (everyπ radians, or 180°), as shown on this plot.
At π/2 radians, or 90° (and -π/2, 3π/2, etc) the function is officiallyundefined, because it could be positive Infinity ornegative Infinity.
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