If ., then the value of tan A is

Given: cos A = …eq. 1

d we know that _{tan A =}

We have value of cos A, we need to find value of sin A

Also we know that, sin A = √ (1-cos^{2} A) …eq. 2

(∵, sin^{2} θ +cos^{2} θ =1

⇒ sin^{2} A = 1-cos^{2} A

⇒ sin A = √ (1-cos^{2} A)

Thus,

Substituting eq. 1 in eq. 2, we get

Sin A =

Therefore,

1