Always keep in mind what you are doing. For example many students found the x component of a position and the y component of a position and the hypotenuse for that position which is fine. Then many of you used this to find the angle using you calculator's inverse cos or inverse sin functions and compared it with the angle measured by protractor. This is also fine although you should keep in mind which measurement, say 19 cm with a precision of 1/10 cm or degrees with a precision of a degree or two, is more accurate.
However some of you used the angle from inverse cos and inverse sin and then used that angle to find cos and sin again. This is circular reasoning. Starting with cos and using it to find the angle and then finding cos of that angle is just wasting time and demonstrating that you don't really know what the cos means.
Again, think about what your are doing and understand why you are doing it. DO NOT REDUCE THINGS TO BLINDLY FOLLOWING PROCEDURES AND USING FORMULAE.
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