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AysviL [449]
3 years ago
6

- Save & Exit Certify

Mathematics
1 answer:
OverLord2011 [107]3 years ago
4 0

Answer:

Do you have a picture because i work better with pictures

Step-by-step explanation:

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I cant solve this can i get some help? <br> 2 cos x + √ 2 = 0
Alexandra [31]

Answer:

Step-by-step explanation:

2 cos x + √ 2 = 0

2 cos x = -√ 2

cos x = -√ 2  / 2

x = arcCos(  -√ 2  / 2 )

so to solve we have to use  "co-terminal " angles .. do you know what I'm saying?  do you understand the words coming out of my mouth :DDDDD OKay back to math and not movie lines .. :P

x = arcCos(  √ 2  / 2 )

x = 45 °

now find the "co terminal" angle that is on 45 ° but in the correct quadrant... since the  -√ 2   is negative.. we now that we go down the y axis.. but also positive on the x axis.. soooo.. that put the angle in the 4th quadrant... so this is an angle of 315° if we go in the CCW  ( counter clock wise )  direction but it's also -45°  in the CW  (clock wise )  direction

below is the table to remember the trig special angles

notice how it's  1,2,3,4    .. so it's super easy to remember.. the trig books don't show you this "trick"   :P

copy and paste this to your computer some where handy

Sin(0) = 0/2      =0  

Sin(30)= \sqrt{1}/2   = 1/2  

Sing(45) =\sqrt{2}/2 =\sqrt{2}/2  

Sin(60)=\sqrt{3}/2   = \sqrt{3}/2  

Sin(90)=\sqrt{4}/2   = 1  

Cos is exactly the same but counts backwards from 90°

Cos(90) = 0/2       = 0

Cos(60) = \sqrt{1} /2   = 1/2

Cos(45) = \sqrt{2}/2    =\sqrt{2}/2

Cos(30) = \sqrt{3}/2   =\sqrt{3}/2

Cos(0) = \sqrt{4}/2    = 1

8 0
3 years ago
Can someone help me with this please
Natasha2012 [34]

Answer: -6 -2

Step-by-step explanation:

6 0
2 years ago
Please help with this<br><br>​
julia-pushkina [17]

Answer:

-11

Step-by-step explanation:

4 0
2 years ago
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Which figure shows how a shape can be rotated about an axis to form a cylinder?
cluponka [151]

Answer:

the bottom right

Step-by-step explanation:

4 0
3 years ago
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How many toothpicks are needed to build the tree on day 100?​
Mariana [72]

Answer:

100 x 4 = 400 - 91 = 309

Step-by-step explanation:

4 0
3 years ago
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