Question

If tanx = 1, and 0< x < 90 degrees, find cos(x/2)? a. $-\frac{\sqrt{2+\sqrt{2} } }{2}$ b. $\frac{\sqrt{2+\sqrt{2} } }{2}$ c. $\frac{\sqrt{2-\sqrt{2} } }{2}$ d. $-\frac{\sqrt{2}-\sqrt{2} }{2}$

Answer 1

Answer:

B is the correct answer.

Step-by-step explanation: If tanx=1, then cosx=√2/2. Use your half angle formulas to plug cosx in, and you should get B as your answer.