What is the basic trigonometric identity you would use to verify that secx sinx = tanx

The answer is for the problem shown above is:

 secx=1/cosx

 The explanation is shown below:

 1. To solve this problem you must apply the following proccedure:

 2. You have  to verify if secx sinx=tanx, so, you have:

 3. You know that secx=1/cosx, and tanx=sinx/cosx, therefore:

 (secx)(sinx)
 (1/cosx)(sinx)
 sinx/cosx
 tanx

Answerthe simplified expression isexplanationthe given expression is,let us deal with the bracket first.the two negatives in the parenthesis will become positive.the expression now becomes,we now expand the parenthesis to get,we group like terms to obtain,this simplifies to,

J= r + 9 because since jessica rode 9 more miles than roger, you add 9 miles to rogers mileage.