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3 years ago

I need help please assaaap

Mathematics

1 answer:

max2010maxim [7]3 years ago

4 0

The answer is A. Use the given functions to set up and simplify f(-2).

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Please help ASAP!

Kruka [31]

First, recall that

$\sin(-\theta)=-\sin\theta$

So if $\sin(-\theta)=\dfrac15$ , then $\sin\theta=-\dfrac15$ .

Second,

$\tan\theta=\dfrac{\sin\theta}{\cos\theta}$

We know that $\tan\theta>0$ and $\sin\theta$ , which means we should also have $\cos\theta$ .

Third,

$\sin^2\theta+\cos^2\theta=1\implies\cos\theta=\pm\sqrt{1-\sin^2\theta}$

but as we've already shown, we need to have $\cos\theta$ , so we pick the negative root.

Finally,

$\tan\theta=\dfrac{\sin\theta}{\cos\theta}\iff\dfrac6{\sqrt{12}}=\dfrac{-\frac15}{\cos\theta}\implies\cos\theta=-\dfrac1{5\sqrt3}$

Unfortunately, none of the given answers match, so perhaps I've misunderstood one of the given conditions... In any case, this answer should tell you everything you need to know to find the right solution from the given options.

6 0

3 years ago

Factorise 9a^2 - 6ab + 12ac - 8bc

Lady_Fox [76]

9a^2-6ab+12ac-8bc
=3a(3a-2b)+4c(3a-2b)
=(3a+4c)(3a-2b)
There you go. Have fun!

6 0

3 years ago

The scale on a map indicates that 1 inch corresponds to an actual distance of 95 miles. two cities are 4.5 inches apart on the m

arlik [135]

The two cities are actually 427.5 miles apart.

3 0

3 years ago

Find the zeros (roots, x-intercepts) for each po<br> 3. f(x) = 5x^3- 20x

Aliun [14]

Answer:

v211

Step-by-step explanation:

6 0

3 years ago

How should 48 eggs be divided so that the ratio is 4:3:5

dolphi86 [110]

Do 4+3+5 which = 12
then do 48 divided by 12 which is 4
Now 4 x 4 = 16
3 x 4 = 12
5 x 4 = 20
16 + 12 + 20 = 48 so its divided as 16:12:20

5 0

3 years ago

I need help please assaaap ​

I need help please assaaap