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tan(61°) = 1.80405 (rounded)
tan(135 degrees) = negative 1.
0.000155334 (rounded)
0.26794919243112270647255365849413
Tangent repeats every 180 degrees, so Tan(180 + a) = tan(a). This site has several useful identities.http://www.mathwords.com/t/trig_identities.htm