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LekaFEV [45]
3 years ago
8

Find values of 3sin^2x-2cosx-3=0

Mathematics
1 answer:
sergij07 [2.7K]3 years ago
4 0

Answer:

Step-by-step explanation:

3 sin²x-2cos x-3=0

3(1-cos² x)-2 cos x-3=0

3-3 cos²x-2 cos x-3=0

-3 cos ²x-2 cos x=0

cos x( -3cos x-2)=0

cos x=0

x=(2n+1)π/2,where n is an integer.

or -3 cos x-2=0

3 cos x=-2

cos x=-2/3

x=cos ^{-1}(-2/3)≈131.81°

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Which expression is equivalent to 17s - 10+3(2s+1)
k0ka [10]

Answer:

23s-7

Step-by-step explanation:

expand

17s-10+6s+3

simplify

=23s-7

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3 0
3 years ago
Which of the following describes an irrational number?
BabaBlast [244]

Answer:

A.

Step-by-step explanation:

B is wrong because irrational numbers can include pie.

C and D are wrong because irrational numbers don't get a whole number, and instead gives a decimal numbers.

4 0
4 years ago
I want the solution, please<br>​
Savatey [412]

Answer:

7 and 7

Step-by-step explanation:

1*13=13

2*12=24

3*11=33

4*10=40

5*9=45

6*8=48

7*7=49: This is the peak

3 0
3 years ago
988,18<br> is divisible by 6.
zheka24 [161]
988,188 is divisible by 6
5 0
4 years ago
What is the answer to this somebody!!!
Galina-37 [17]

So with this, you'll be using a proportion to solve it. And here's what your equation will look like:


\frac{30}{x} =\frac{x}{24}


Firstly, you'll need to cross-multiply. Your equation will look like this: 720=x^2


For this, all you need to do is square root, and your answer is \sqrt{720} =x, however this answer can be simplified further.


\sqrt{720} =\sqrt{30*24} =\sqrt{5*6*6*4}=\sqrt{5*3*2*3*2*2*2} =4*3\sqrt{5} =12\sqrt{5}


In short, your answer is 12\sqrt{5}

7 0
3 years ago
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