a) express in term of X :
b) Find:
Hello, viet!
a) Express in term of : .
We will need the identity: .
Recall that an inverse trig value is an angle.
Let
Since , we have:
. . and Pythagorus gives us:
Hence: .
The problem becomes: .
. . . . . .
b) Find: .
We have: .
Then: .
. . Hence: .
And: .
. . Hence: .
The problem becomes: .
Multiply top and bottom by
I hope I didn't make any stupid blunders . . .
I used your method for part B on a similar problem and it is not working.
numbers were 5/6 for the sin, 5/9 for the cos.
ended with (((5/sqrt(11))+(sqrt(56)/5))/(1-(5/sqrt(11))*(sqrt(56)/5)))*sqrt(11)
but it is wrong
Hello, thedoge!
I used your method for part B on a similar problem and it is not working.
Numbers were 5/6 for the sin, 5/9 for the cos.
Ended with: (((5/sqrt(11))+(sqrt(56)/5))/(1-(5/sqrt(11))*(sqrt(56)/5)))*sqrt(11) .??
but it is wrong
Evidently, your preliminary work is correct.
. .
Identity: .
We have: .
Multiply top and bottom by