Processing Math: Done

From Förberedande kurs i matematik 1

Suppose that cosx=0, so that we can divide both sides by cosx to obtain

sinxcosx=3i.e.tanx=3.

This equation has the solutions x=3+n for all integers n.

If, on the other hand, cosx=0, then sinx=1 (draw a unit circle) and the equation cannot have such a solution.

Thus, the equation has the solutions

x=3+n(n is an arbitrary integer).