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[" Q18.Prove that:- "(tan x)/(1-cot x)+(...

[" Q18.Prove that:- "(tan x)/(1-cot x)+(cot x)/(1-tan x)=1+sec x+cosec x],[" Q19.The angles of depression of the top and the bottom of an "8m" tall building "]

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(tan x)/(1-cot x)-(cot x)/(1-tan x)=(sec x cos(x+1))

Prove that : (tan A)/ (1 - cot A) + (cot A)/ (1 - tan A) = sec A cosec A + 1

tan^(-1) (cot x) +cot^(-1)(tan x) =

int (dx)/(tan x+ cot x+ sec x+ cosec x)

Prove that tan^(-1)(cot x)+cot^(-1)(tan x)=pi-2x

Prove that tan(cot^(-1)x)=cot(tan^(-1)x)

Prove that tan(cot^(-1)x)=cot(tan^(-1)x)

Prove that tan(cot^(-1)x)=cot(tan^(-1)x)

tan^(-1)(cot x)+cot^(-1)(tan x)