Grade 12Trigonometry
Find the value of tan
-11 + tan-12 + tan-13.
Find the value of tan
-11 + tan-12 + tan-13.
1 Answer
Moni RS
let tan-1(1) + tan-1(2) + tan-1(3) = x
but tan-1(1)= p/4
tan-1(2)+tan-1(3)=tan-1((2+3)/(1-2*3))=tan-1(-1)= - tan-1(1)
therefore tan-1(1)+(- tan-1(1))=0.
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