" (iv) "tan(60^(@)+A)tan(60^(@)-A)=(2cos2A+1)/(2cos2A-1)

Prove that : tan (60^@+A) tan (60^@-A)= (2 cos 2A+1) / (2 cos 2A-1) .

Show that: tan(60^(@)+theta)tan(60^(@)-theta)=(2cos2 theta+1)/(2cos2 theta-1)

(1+tan^(2)60^(@))^(2)=

Prove that tan (60^(@)-theta) tan (60^(@)+theta)=(2cos 2theta+1)/(2 cos 2 theta-1)

Prove that : ((tan60^(@)+1)/(tan60^(@)-1))^(2)=(1+cos30^(@))/(1-cos30^(@))

Prove that: (i) cos A cos(60^(@)-A)cos (60^(@)+A)=(1)/(4)cos 3A (ii) "tan" A+"tan"(60^(@)+A)-"tan"(60^(@)-A)=3 tan 3A .

((tan60^(@)+1)/(tan60^(@)-1))^(2)=(1+cos30^(@))/(1-cos30^(@))

Prove that : (i) ((tan 60^(@)+1)/(tan 60^(@) - 1))^(2) = (1 + cos 30^(@))/(1 - cos 30^(@)) (ii) 3 "cosec"^(2) 60^(@) - 2 cot^(2) 30^(@) + sec^(2) 45^(@) = 0

Evaluate : (3tan25^(@)tan40^(@)tan50^(@)tan65^(@)-(1)/(2)tan^(2)60^(@))/(4(cos^(2)29^(@)+cos^(2)61^(2)))

Evaluate : (3tan25^(@)tan40^(@)tan50^(@)tan65^(@)-(1)/(2)tan^(2)60^(@))/(4(cos^(2)29^(@)+cos^(2)61^(2)))