Sum and Diff Identities: Find sin(A+B) and sin(A-B) given sin(A) and sin(B)

This video explains how to use reference triangles to determine sin(A+B) and sin (A-B) given sin(A) and sin(B).

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Given sin(A)=2/5 and Quadrant of A, Find 5 Trig Function Values

This video explains how to find the 5 remaining trigonometric function values given the sine function value and the quadrant of the angle.