Question

if 3cot A=4, check whether 1-tan2A/1+tan2A=cos2A-sin2A or not​

Answer 1

The proof shows that LHS not equal to RHS.

Wait .. is it

tan^2 A ; cos^2 A ; and ; sin^2 A .. ??

If so then check out the foll ..

cot A =4/3

BC=3 and AB=4 So AC=?

<B at right angled triangle >

(AC)^2=(AB)^2 + (BC)^2

AC=5

tan =3/4

1-9/16/1+9/16

=5/16/25/16

=1/5 = LHS

cos a=4/5

sin a=3/5

=16/25 - 9/25

=5/25

=1/5. = RHS

Therefore,

LHS equal to RHS.

Hope this helps

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