SOLUTION: Please help me: 1. The radian measure of angle containing x degree is: A.pi.x/180 B. pi.x/90 .C other answer(plz explain) 2. If cos x=1/2, then sin x= ? 3. If cotx=1, then x= ?

Question 381387: Please help me:
1. The radian measure of angle containing x degree is: A.pi.x/180 B. pi.x/90 .C other answer(plz explain)
2. If cos x=1/2, then sin x= ?
3. If cotx=1, then x= ?
Answer by richard1234(7193) (Show Source): You can put this solution on YOUR website!
1. Answer is A.
2. If cos x = 1/2 then sin x = sqrt(3)/2 or -sqrt(3)/2. This is due to the Pythagorean identity .
3. If cot x = 1 then tan x = 1. It follows that either x = pi/4 or x = 5pi/4 (if x is between 0 and 2pi)
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