Ask question

Ask question

All categories

3 years ago

14

Hi can someone please help me? If sin2A=cos 3A find the value of A. Can you please explain in full detail how you arrived at you

r answer? Also Find the exact value of (sec30)^2. Will I need to use a calculator in order to solve this prob?

1 answer:

cupoosta [38]3 years ago

6 0

<span>Sin (x) = Cos (90 - x)</span>
<span>sin(2A) = cos (90 - 2A)
=cos (3A)
90 - 2A = 3A
5A=90
A=18</span>

You might be interested in

Compute the probability of flipping a coin once and getting heads, given that the previous flip was tails.

ra1l [238]

Answer:

the probability to flip a head is 50%

Step-by-step explanation:

I think.

5 0

3 years ago

Suppose that p is the probability that a randomly selected person is left handed. The value (1-p) is the probability that the pe

solmaris [256]

Answer:

a) 1/2

b) 250

Step-by-step explanation:

The start of the question doesn't matter entirely, although is interesting to read. What we are trying to do is find the value for $p$ such that $1000p(1-p)$ is maximized. Once we have that $p$ , we can easily find the answer to part b.

Finding the value that maximizes $1000p(1-p)$ is the same as finding the value that maximizes $p(1-p)$ , just on a smaller scale. So, we really want to maximize $p(1-p)$ . To do this, we will do a trick called completing the square.

$p(1-p)=p-p^2=-p^2+p=-(p^2-p)=-(p^2-p+1/4)-(-1/4)=-(p-1/2)^2+1/4$ .

Because there is a negative sign in front of the big squared term, combined with the fact that a square is always positive, means we need to find the value of $p$ such that the inner part of the square term is equal to $0$ .

$p-1/2=0\\p=1/2$ .

So, the answer to part a is $\boxed{1/2}$ .

We can then plug $1/2$ into the equation for p to find the answer to part b.

$1000(1/2)(1-1/2)=1000(1/2)(1/2)=1000*1/4=250$ .

So, the answer to part b is $\boxed{250}$ .

And we're done!

3 0

2 years ago

I got this question wrong on a warm-up in class and I'm doing error analysis. Can someone solve this and explain why? I'm giving

Studentka2010 [4]

Answer:

your answer would be D :)

7 0

2 years ago

Which of the following statements is false regarding randomization?

MrRissso [65]

Answer:

II) randomization helps avoid blas

Step-by-step explanation:

3 0

4 years ago

Tori went to the eye doctor. He dilated her pupils to twice their normal size during the exam. If her pupils were 2 mm oeiginall

jok3333 [9.3K]

4 pupils bc 2*2=4..................................................................................................................................................................................................................................................................

6 0

3 years ago

Read 2 more answers