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(1-tan^(2)45^(@))/(1+tan^(2)45^(@))=...

(1-tan^(2)45^(@))/(1+tan^(2)45^(@))=

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(1-tan^(2)(45^(@)-A))/(1+tan^(2)(45^(@)-A)) is equal to

Prove the following : (1-tan^2(45^@-A))/(1+tan^2(45^@-A)) = sin2A

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

Choose the correct option and justify your choice.:- (1-tan^2 45^@)/(1-tan 45^@)

(1-tan^(2)(45^(@)-theta))/(1+tan^(2)(45^(@)-theta))=

(1 - tan^2 45^0)/(1 + tan^2 45^0)

(1-tan^(2)45o)/(1+tan^(2)45o) is equal to tan90o(b)1(c)sin450(d)sin0o

tan225^(@)=tan(180^(@)+45^(@)) =tan45^(@)=1