Question: Evaluate without using tables / calucator
1) cos (inverse) {(underroot 3/2) }
Solution:
Let,
y=cos(inverse) (√3÷2)
cosy=√3÷2
cosy=cos30
y= 30
Answer is 30
But the answer book, Answer is pie/6
Why? How can i convert it to the answer in the answer book? Any idea?
how 30 become pie/6
?