Answer: option b.
Explanation:
To solve this exercise you must keep on mind the identities shown below:
1)
![sec\theta=(1)/(cos\theta)](https://img.qammunity.org/2020/formulas/mathematics/high-school/scjx2vr1cx4etbhpp7umzobaiemmz5r9zt.png)
2)
![csc\theta=(1)/(sin\theta)](https://img.qammunity.org/2020/formulas/mathematics/high-school/ve19zlmgnz0s68fekfjgocngyal0mi5vzi.png)
3)
Therefore, to rewrite
you must substitute identities and simplify the expression, as following:
![(sec\theta)/(csc\theta)=1\\\\((1)/(cos\theta))/((1)/(sin\theta))=1\\\\(sin\theta)/(cos\theta)=1\\\\tan\theta=1](https://img.qammunity.org/2020/formulas/mathematics/high-school/me8b0p1r5f288ciql12jawv1v6bqk4vbsj.png)
Therefore, as you can see, the answer is the option b.