Sine Cosine Relationship in Right Triangles

Which two(2) functions are equal to 8/17?

If cos B = 3/5, which one of the following is also equal to 3/5?

Cos(42^o)=0.743 approximately. Which of the following must also equal 0.743(approx.)?

 $\angle A\ and\ \angle B$  are the acute angles in a right triangle. $Cos\ A=\frac{3}{5},\ Sin\ A=\frac{4}{5},\ and\ Tan\ A=\frac{4}{3}$ .  Which is the value of 

Cos B? 

 $\angle E\ and\ \angle F$  are the two(2) acute angles in a right triangle.  If Tan E = 1, which of the following is NOT true?