What is the answer to this and how do you work it out?
Let the 2x2 matrix R represent a rotation that rotates a 2D object counterclockwise
70 degrees around the coordinate origin. Suppose
R = ( r 11 r 12
r 21 r 22 )
Find the value for element r12. (Rounding your answer to 2
decimal places)

answers:
nbsale say: It's all in https://en.wikipedia.org/wiki/Rotation_m...

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wgzix say: eryftnsn
