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17 votes
17 votes
PLEASE HELP ME ASAP. 40 POINTS!!! With an explanation if you can please, I would really appreciate it

PLEASE HELP ME ASAP. 40 POINTS!!! With an explanation if you can please, I would really-example-1
User DollarAkshay
by
2.3k points

1 Answer

8 votes
8 votes

9514 1404 393

Answer:

y = 1 +4√2

Explanation:

The hints can be useful here.

At x=0, the equation becomes ...

y = a·cos(0) +b = a + b = 9

At x = 90°, the equation becomes ...

y = a·cos(90°) +b = b = 1

Then the value of 'a' is ...

a +1 = 9 ⇒ a = 8

and the equation for y is ...

y = 8·cos(x) +1

__

For x = 45°, this is ...

y = 8·(√2/2) +1 = 1 +4√2

_____

Your short table of trig function values will tell you cos(45°) = (√2)/2.

User Archgl
by
2.7k points
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