Given that cos2y = -7/25 such that y is between 90 and 180 degrees. What is the value of siny?
I want to know if it can be solved by first converting to tan2y and then creating a quadratic equation. Thanks!
I want to know if it can be solved by first converting to tan2y and then creating a quadratic equation. Thanks!
1 Answer
Mar 26, 2018
Explanation:
Given:
There are a number of ways to solve this problem.
Solve using the double angle identity:
Subtract
Divide by
Realize that:
Square root both sides:
I wouldn't solve using
You don't know