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Grade: 12
        


Find the value of tan



-11 + tan-12 + tan-13.

9 years ago

Answers : (1)

Moni RS
18 Points
							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.

						
9 years ago
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