cant be closer than this!
i thought there must be something addition of two "sin"s and their coefficients should be different from each other. this solution makes me happy...
but i want to know how can you produce a polar coordinated graph in excel?
1. Set up two columns of values: and . Use values of from to .
2. Create two further columns and .
3. Use the XY (Scatter) graph-type using the and values, choosing the 'smoothed lines without markers' sub-type.