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A Youtube video from Khan Academy
A Youtube video from chycho.
The instructor is soft-spoken
Note: There may be a short ad at the beginning.
A Youtube video from WestviewMathematics
A Youtube video from Dr. Jack L. Jackson II
He defines the Tangent function of an acute angle via similar right triangles.
He defines the Sine and Cosine functions of an acute angle via similar right triangles.
Trigonometric FunctionsExcellent review and exercises from MathBitsNotebook.com
Exercise Worksheets from Kuta Software, including answer keys
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