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The body is the hero

Hello guys,

   I was chatting earlier today and someone told me that science must be considered the hero of our time mainly when it comes to our immune system. Thenceforth, I decided to post exactly what I have learned from the past few days and I hop

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Geometry (I)

Imagine that we have 2 parallel lines and there are 5 points on each line.

How many triangles can we make by them?

 

 

1-      100

2-      200

3-      150

4-      300

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Let's study "Mathematics" with each other! (6)

1.

If:

 

f(x)=  x  , for x≤1       &      x^2  ,for  x>1

 

Then,

What is the inverse of f(x)?

 

1-    x  , for x≤1       &      √x  ,for  x>1

2-    -x  , for x≤1       &      -√x  ,for  x>1

3-    1/x  , for x≤1       &      1/x^2  ,for  x>1

4-    -1/x  , for x≤

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Let's study "Mathematics" with each other! (7)

1.

sin-1 x + cos-1 x=?

 

1-    π/4

2-    π

3-    π/2

4-   

 

     *******       *******       *******       *******       *******

2.

If,

 

-π/2 < Ө < π/2

Sinhx= tgӨ

 

Then,

 

Coshx=?

 

1-    cos Ө

2-    csc Ө

3-    sec Ө

4-    sin Ө

 

     *******       *******       ***

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Let's study "Mathematics" with each other! (2)

1-If we have:

 

[x] ≤ (x/2)

 

Then which one is right?

 

1-      {x: x>1}

2-      {x: x<1}

3-      {x: -1<x<1}

4-      {x: -2<x<0}

 

       *******       *******       *******       *******       *******

 

2-Which one is odd?

 

1-      Ln {x+(1+x2)}

2-      e^sinx

3

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Let's study "Mathematics" with each other!

Hi dear friends!

How are you?

Are you interested in "Math"?!

So…

Let's study it together!

 

Please answer these questions:

 

1-      If  we have:

 

1< (2|x|-1)/|x|+1 < 2

 

Then;

Which one is right?

 

1)      x > 1/2

2)      -2 < x < 2

3)      x < -(1/3) or x > (1/3)

4

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Let's study "Mathematics" with each other! (4)

 

1-      If we have:

 

f(x)= x^2+2x

g(x)=x^3

 

Then, how many answers can (gof)(x)=(fog)(x) have?

1-      1

2-      2

3-      3

4-      6

 

       *******       *******       *******       *******       *******

 

 

2-      If we have:

 

f(x)=2[x]+2[-x]

 

Then, what is

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