Texas Instruments TI-80 User Manual - Page 63
item 4 converts the given rectangular, can be lists.
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R8Pr ( R8Pq( P8Rx( P8Ry( Note: When converting from one coordinate system to the other, be sure that the angle mode setting, DEGREE or RADIAN, is appropriate for your angle measurements. (Press 3 to check the current setting.) R8Pr( (ANGLE, item 3) converts the given rectangular coordinates to polar coordinates and returns r. R8Pq( (ANGLE, item 4) converts the given rectangular coordinates to polar coordinates and returns q. Both X and Y can be lists. R8Pr(X,Y) R8Pq(X,Y) RADIAN Mode P8Rx( (ANGLE, item 5) converts the given polar coordinates to rectangular coordinates and returns x. P8Ry( (ANGLE, item 6) converts the given polar coordinates to rectangular coordinates and returns y. Both R and q can be lists. P8Rx(R,q) P8Ry(R,q) RADIAN Mode Math, Angle, and Test Operations 2-15