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tan 2 = 2 * 3/4 / 1-(3/4)²
tan 2 = 3/2 / 7/16
tan 2 = 24/7
tan 4 = tan 2 * 2
= 2 x tan 2 / 1 - (tan 2 * tan 2 )
= 2 x 24/7 / 1 - (24/7)²
= 48/7 / -527/49
= 336/49 / -527/49
= -336/527
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