The Student Room Group
The tangent function has a period of 180 degrees so tan300=tan120=tan(60)\tan 300 = \tan 120 = \tan (-60) .

From the symmetry of the graph, you should know that tanx=tan(x)- \tan x = \tan (-x) .

You should learn the exact values of tan 30, tan 45 and tan 60 (or know how to obtain them from a sketch of a right-angled triangle).

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