Tangent/Cotangent formulas:
tan( A+B)= tanA+ tan B/1-tanA tanB
tan( A-B)= tanA- tan B/1+tanA tanB
cot is reciprocal :
cot(A+B)= 1-cotA
cot B/ cot A+ cot B
tan( A-B)= tanA- tan B/1+tanA tanB
cot is reciprocal :
cot(A+B)= 1-cotA
cot B/ cot A+ cot B
Ex: Simplify tan40+tan20/1+tan40tan20
tan(40+20)tan(60)
square root of 3
Ex 2:tan(27) + tan(18)/1 - tan(27)tan(18)
tan(a + b) = tan (27 + 18) = 45tan(45) = 1
Well thats it
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