Question

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

Answer 1

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.