sec(45^(@)+A)*sec(45^(@)-A)=2sec2A

Prove that: sec(45^(@)+A)sec(45^(@)-A)=2secA

sec(45^(@)+A)sec(45^(@)-A)=(i)sec2A(ii)cos2A(iii)2cos2A(iv)2sec2A

Prove that : (2tan^(2)30^(@))/(1-tan^(2)30^(@))+sec^(2)45^(@)-cot^(2)45^(@)=sec60^(@) .

Find the value of   sec ^(2)45 ^(@) cos 45 ^(@)-"cosec"^(2) 30^(@) tan 45 ^(@)

If (2tan^(2)30^(@))/(1-tan^(2)30^(@))+sec^(2)45^(@)-sec^(2)0^(@)=xsec60^(@) , then the value of x is

Evaluate each of the following :- (cosec^(2)45^(@)sec^(2)30^(@))(sin^(2)30^(@)+4cot^(2)45^(@)-sec^(2)60^(@))

Calculate : sec^(2)45^(@)-cot^(2)45^(@)-sin^(2)30^(@)-sin^(2)60^(@) .

sec^(2)A(1+sec2A)=2sec2A