1.

If $$\sin \theta- \cos \theta= \frac{7}{{13}}$$and $${0^ \circ }{\text{ < }}\theta {\text{ < }}{90^ \circ }{\text{,}}$$then the value of $$\sin \theta $$+ $${\text{cos}}\theta $$is?

A. $\frac{{17}}{{13}}$$
B. $\frac{{13}}{{17}}$$
C. $\frac{1}{{13}}$$
D. $\frac{1}{{17}}$$
Answer» B. $\frac{{13}}{{17}}$$


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