The long expression I get can be simplified to that answer by rationalizing the denominator (among other things).View attachment 33557
guys I need help with this,
I worked out the value of sin and cos already from a triangle diagram
but when I substituted i ended up with long expression that is not equal to the right figures.
Can somebody help me?
most likely the "among other things" part that I miss hahahaThe long expression I get can be simplified to that answer by rationalizing the denominator (among other things).
If you're saying that you tried evaluating your expression and it was different from the decimal value of what's shown, then either there's a mistake in your work so far, or you made a mistake in your evaluation. We can't tell where the error is without seeing it.
Show us your work so far, and we can check if it's right, and tell you what to do next.