Question

What are $\tan$, $\cos$, and $\sin$?

Answer 1

$\tan$, $\cos$, and $\sin$ are three primary trigonometric functions or trigonometric ratios. $\tan$, $\cos$, and $\sin$ are abbreviations of $tangent,cosine$ and $sine$ respectively.

In a right-angled triangle, we use these trigonometric functions to find the angles.

• The sine function is the ratio of the opposite side of angle and hypotenuse.
• The cosine function is the ratio of the adjacent side of angle and hypotenuse.
• Tangent function is the ratio of the opposite side and adjacent side.

In a right-angled triangle $ABC$,

• $\sin C=\frac{AB}{AC}$
• $\cos C=\frac{BC}{AC}$
• $\tan C=\frac{AB}{BC}$