 Hello and welcome to the session. Let's work out the following question. It says choose the correct option. Justify your choice. So let's now start the solution. The given expression is secant a plus tan a into 1 minus sin a. I will simplify this expression. Now secant a can be written as 1 upon cos a tan a can be written as sin a upon cos a into 1 minus sin a. Now taking LCM. So we have 1 plus sin a in the numerator into 1 minus sin a. Now here we see that we have 1 plus sin a and 1 minus sin a in the numerator. So we use the formula of a square minus b square which is a minus b into a plus b and here a is 1 and b is sin a upon cos a. It is 1 minus sin square a upon cos a. Now we know that 1 minus sin square a is cos square a upon cos a. So this is equal to 1 minus sin square cos a. So the correct option is option b. So option b is the required answer. This completes the question and the session. Bye for now. Take care. Have a good day.