Krishna
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Step 1:  Recall the definition of the \tan

DEFINITION: The tangent (tan) of an angle in a right triangle is a ratio. It is

the length of the opposite leg (opp) divided by the length of

Step 2: Take any one acute angle (A or B) and apply the \tan rule.

EXAMPLE: Take A angle

Opposite side of angle A = CB = a

Adjacent side of angle A = AC = b

\tan = \frac{a}{b}

Step 3: In the same way apply the   \tan rule to another acute angle.

EXAMPLE: Take B angle

Opposite side of angle B = AC = b

Adjacent side of angle B = BC = a

\tan = \frac{b}{a}