SOLUTION: 18. If cos= 2 to the square root of 10/7 calculate the value of sin. a. 3/7 b. square root of 29/7 c. square root of 69/7 d. square root of 89/7

Algebra ->  Trigonometry-basics -> SOLUTION: 18. If cos= 2 to the square root of 10/7 calculate the value of sin. a. 3/7 b. square root of 29/7 c. square root of 69/7 d. square root of 89/7      Log On


   

Question 624950: 18. If cos= 2 to the square root of 10/7 calculate the value of sin.
a. 3/7
b. square root of 29/7
c. square root of 69/7
d. square root of 89/7
Found 2 solutions by Alan3354, jsmallt9:
Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
If cos= 2 to the square root of 10/7
-------------
???
2%5E%28sqrt%2810%2F7%29%29 ??

Answer by jsmallt9(3758) About Me  (Show Source):
You can put this solution on YOUR website!
  • Please post questions like this under "trigonometry"
  • "2 to the square root of 10/7"???
    This means:


    2%5E%28%28sqrt%2810%2F7%29%29%29 or 2%5E%28%28sqrt%2810%29%2F7%29%29
    Either one is a number greater than 1 which is an invalid value for cos. (Even 2%2Asqrt%2810%2F7%29 or 2%2A%28sqrt%2810%29%2F7%29 are invalid.) Either you were given a bad problem are you have made an error in how you posted it. If none of the above expressions are in your problem, then the error is in how you posted it.
  • Please post square roots more clearly. For example:
    "square root of 29/7" means sqrt%2829%2F7%29
    None of the square roots, as you posted them, are valid values for sin or cos because they are all greater than 1. So I assume that by
    "square root of 29/7" you meant sqrt%2829%29%2F7 which is a valid sin or cos.
    If so, then you should post
    "(square root of 29)/7" or "sqrt(29)/7"