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Project: DSP
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parametric_plot((sin(3*x),cos(5*x)),(x,0,2*pi))
plot3d(cos(x*y),(x,-4,4),(y,-4,4))
Error in lines 1-1 Traceback (most recent call last): File "/cocalc/lib/python2.7/site-packages/smc_sagews/sage_server.py", line 1013, in execute exec compile(block+'\n', '', 'single') in namespace, locals File "", line 1, in <module> NameError: name 'y' is not defined