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vesna_86 [32]
3 years ago
12

Verify the identity. cos quanity x plus pi divided by two = -sin x

Mathematics
1 answer:
7nadin3 [17]3 years ago
4 0

Answer:

see below

Step-by-step explanation:

cos ( x+pi/2) = -sinx

We know that

cos(A + B) = cos A cos B - sin A sin B

Let x = A and pi/2 = B

cos x cos pi/2 - sin x sin pi/2 = -sin x

We know cos pi/2 = 0  and sin pi/2 = 1

cos x * 0 - sin x *1 = -sin x

- sin x = - sin x

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If there are 18 boxes with 12 caculators in each box how many caculators are there in total
Dahasolnce [82]
The number of calculators
= Number of boxes * calculators in each box
=18* 12
= 216 calculators
7 0
3 years ago
A rectangular aquarium 3 ft. x 2 ft. 1 ft. is 2/3 full of water. In cubic feet, how much water is in the tank
tatuchka [14]

To find the volume of a rectangular prism, we must multiply the length * width * height.


In this case,


Volume = 3 ft * 2 ft * 1 ft

= 6 ft^3


Because this tank is 2/3 full with water, to find out how much water is in the tank, we must multiply 2/3 by the total volume of the tank (6 ft^3).


2/3 * 6 ft^3 = 4 ft^3


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Hope this helps!

6 0
3 years ago
Which graph shows a line that is perpendicular to line AB?
kherson [118]
The 3rd slot is the answer you are looking for
5 0
3 years ago
Help me please help me help please me please pleases me please please help
kifflom [539]

Answer:

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7 0
2 years ago
Read 2 more answers
Tina is saving to buy a notebook computer. She has two options. The first option is to put $500 away initially and save $30 ever
Jlenok [28]
First option:
y=money saved
x=number of months

y=30x+500

Second option:

y=50x+200

We have this system of equations:

y=30x+500
y=50x+200

We can solve this system of equations by equalization method
30x+500=50x+200
30x-50x=200-500
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x=-300/-20
x=15

so;
y=30x+500
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y=450+500
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Answer; after 15 months, she would save the same amount using either option, the amount saved in either option will be $950. 
3 0
3 years ago
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