Answer: sin u = -5/13 and cos v = -15/17
Step-by-step explanation:
The nice thing about trig, a little information goes a long way. That’s because there is a lot of geometry and structure in the subject. If I have sin u = opp/hyp, then I know opp is the opposite side from u, and the hypotenuse is hyp, and the adjacent side must fit the Pythagorean equation opp^2 + adj^2 = hyp^2.
So for u: (-5)^2 + adj^2 = 13^2, so with what you gave us (Quad 3),
==> adj of u = -12 therefore cos u = -12/13
Same argument for v: adj = -15,
opp^2 + (-15)^2 = 17^2 ==> opp = -8 therefore sin v = -8/17
The cosine rule for cos (u + v) = (cos u)(cos v) - (sin u)(sin v) and now we substitute: cos (u + v) = (-12/13)(-15/17) - (-5/13)(-8/17)
I am too lazy to do the remaining arithmetic, but I think we have created a way to approach all of the similar problems.
Answer:
y = 0
Step-by-step explanation:
x = -3
y = x² + 6x + 9
y = (-3)² + 6(-3) + 9
y = 9 - 18 + 9
y = 0
Answer:
2x-3
Step-by-step explanation:
Example w:5
2(5)-3=7
twice 5 then -3
1.2 plus .75 plus 1.34 plus .49 which is 3.78
1 and 12 lol I hope you ha laughs about his pass this on
