Yes, the sine, cosine and tangent are integral to problem solving (angles and side lengths) in right angle triangles (triangles with a 90 degree angle included).
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cosecant
Trigonometry
It is the reciprocal of the sine ratio.
The sine of one of the acute angles in a right triangle is the ratio of the length of the side opposite the angle to the length of the hypotenuse.
Electromagnetic radiation is propogated as sine waves.