Question

If 3 cot A = 4, check whether $\frac{1-tan^{2}A}{1+tan^{2}A}=cos^{2}A-sin^{2}A$ or not.

Answer 1

Step-by-step explanation:

Cot A = 4/3

tan A =3/4

Perpendicular/Base=3/4

By Pythagoras theorem we get,

Hypotenuse=5

Cos A =Base/Hypotenuse=4/5

SinA=perpendicular/hypotenuse=3/5

Putting these values in LHS and RHS we get both equal to 7/25.

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