`tanx.tan(60^@+x).tan(60^@-x)=tan3x`

(iii) Prove that tan x tan(60-x)tan(60+x)=tan3x

Prove that tanA+tan(60^@+A)-tan(60^@-A)=3tan3A

Prove that : tan A+tan (60^@+A)-tan (60^@-A)=3 tan 3A .

tan A+tan(60+A)-tan(60-A)=3tan3A

int (1)/(" tan x tan" (60^(@) - x) tan (60^(@) + x) ) dx =

Prove that: tan A+tan(60^(@)+A)-tan(60^(@)-A)=3tan3A

Prove that tanAcdottan(A+60^@)+tanAcdottan(A-60^@)+tan(A+60^@)tan(A-60^@)=-3

tanalpha.tan(60^@-alpha).tan(60^@+alpha)=tan3alpha

Prove that tan A. (tan 60^(@) +A). Tan (60^(@)-A)=tan 3A and hence find the value of tan 6^(@) tan 42^(@) tan 66^(@) tan 78^(@) .

int(1)/(Tan x tan(60^(@)-x)Tan(60^(@)+x))dx=