If $\mathrm{cos}2v=-\frac{19}{}$ and v is acute, then determine the value of v

I have tried using the double angle identity

$\mathrm{cos}2v={\mathrm{cos}}^{2}v-{\mathrm{sin}}^{2}v$

Ive

I have tried using the double angle identity

Ive

poveli1e
2022-01-24
Answered

If $\mathrm{cos}2v=-\frac{19}{}$ and v is acute, then determine the value of v

I have tried using the double angle identity

$\mathrm{cos}2v={\mathrm{cos}}^{2}v-{\mathrm{sin}}^{2}v$

Ive

I have tried using the double angle identity

Ive

You can still ask an expert for help

rakije2v

Answered 2022-01-25
Author has **12** answers

Hint

Solving:

$\mathrm{cos}\left(2x\right)=-\frac{19}{}$

For the general case, let the R.H.S constant be k. Well

Solving:

For the general case, let the R.H.S constant be k. Well

asked 2021-09-05

Calculate the average rate of change for the function $f\left(x\right)={x}^{2}+x-12$ , over the interval:

1. [0,3]

2. [-1,10]

1. [0,3]

2. [-1,10]

asked 2021-03-06

Given the values for sin t and cos t, use reciprocal and quotient identities to find the values of the other trigonometric functions of t.

$\mathrm{sin}t=\frac{3}{4}{\textstyle \phantom{\rule{1em}{0ex}}}\text{and}{\textstyle \phantom{\rule{1em}{0ex}}}\mathrm{cos}t=\frac{\sqrt{7}}{4}$

asked 2021-12-16

How do you find the limit of $\frac{\mathrm{cos}x}{1-\mathrm{sin}x}\text{}\text{as x approaches}\text{}\frac{\pi}{2}$ ?

asked 2021-12-05

Find the derivative of $y=\sqrt{x}$ .

asked 2021-10-12

Only 25% of the intensity of a polarized light wave passes through a polarizing filter. What is the angle between the electric field and the axis of the filter?

asked 2021-09-14

Find y as a function of t, if

$\frac{dy}{dt}+\left(0.2\right)ty=4t{\textstyle \phantom{\rule{1em}{0ex}}}\text{and}{\textstyle \phantom{\rule{1em}{0ex}}}y\left(0\right)=9$

asked 2021-02-11

Which statement cannot be true? Explain.

A.

B.

C.

D.