# How do you evaluate #tan(sin^-1(-5/11))# without a calculator?

##### 1 Answer

Oct 11, 2016

#### Explanation:

Let

Then,

The given expression is

Of course, the general value

positive and cos a is negative,

So, ignoring the principal-value-convention for inverse sine, the

answer could be presented as

For me, this is the answer. You can choose yours.