3 years ago

Find the exact value of : cos(2 arctan(4/3))

1 answer:

7 0

Cos(2 arctan(4/3)) = cos(2 arccos(3/5)) = cos^2(arccos(3/5)) - sin^2(arccos(3/5)) = cos^2(arccos(3/5)) - sin^2(arcsin(4/5)) = (3/5)^2 - (4/5)^2 = 9/25 - 16/25 = -7/25.

You might be interested in

Find the value of x required for

Inessa05 [86]

Answer:

Step-by-step explanation:

See attachment

4 0

2 years ago

Question 1 of 10

Archy [21]

Answer:

A. y = 7(x + 1)²-3

Step-by-step explanation:

Parabola:

$y = 7x^{2} + 14x + 4$

$y = 7(x^{2} + 2x) + 4$

Putting into vertex form, remember that:

$(x + a)^{2} = x^{2} + 2ax + a^{2}$

In this question:

$x^{2} + 2x$ , to put into this format:

$x^{2} + 2x + 1 = (x + 1)^{2}$

We add one inside the parenthesis to do this. The parenthesis is multiplied by 7, so for the equivalent, we also have to subtract 7. Then

Vertex form:

$y = 7(x^{2} + 2x + 1) + 4 - 7$

$y = 7(x + 1)^{2} - 3$

So the correct answer is:

A. y = 7(x + 1)²-3

3 0

3 years ago

Investment A :

bixtya [17]

Answer:

hi I don't know what this means I just need points

8 0

3 years ago

Someone please help me. I don't have a pen and paper to work this out

earnstyle [38]

I hope this helps you

5 0

3 years ago

Read 2 more answers

Which of the following choices is NOT GEOMETRIC SEQUENCE.

lina2011 [118]

B is not a geometric sequence

8 0

3 years ago