I have been trying to solve 3 questions, I simply cant. Please find the attachment.
13e: I am not sure whether I did it right or not
13g: After putting it in quadratic formula, i dont know how to deal with the square-root part
13h: I just cant seem to simplify the left side and solve for X
Thanks, all help is appreciated
For problems like 13e, I always write everything in terms of sin's and cos's:
So we see immediately that locations where are not allowed, which means for all
Also, we wish to record the fact that places where are a solution. So that occurs at odd integer multiples of so at Now that we have recorded those two facts, we may cancel all kinds of stuff. What do you get when you do that?
For 13h, I would notice that secant squared's look like tangent squared's through the Pythagorean Theorem:
implies, through dividing through by that
So what can you do then?