Question

find the value of
cos67 1/2​

Answer 1

Answer:

$\sqrt{\frac{1}{2}-\frac{1}{2\sqrt{2} } }$

Step-by-step explanation:

Assume 67.5°=Ф

cos2Ф=2cos^2(Ф)-1

cosФ=Square root of ((1+cos2Ф)/2)

cos67.5°=$\sqrt{\frac{1+cos135}{2} }$ Since Ф lies between 0° to 90°, cosФ is positive.  

I hope this solution helps you.