- #1

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## Homework Statement

2cos^2 4x-1=0

a)x= pi/16 x=3pi/16

## Homework Equations

## The Attempt at a Solution

a) x=pi/16

u=cosx

v=4x

2u^2 v-1=0

i'm stuck here

Last edited by a moderator:

- Thread starter maxtheminawes
- Start date

- #1

- 20

- 0

2cos^2 4x-1=0

a)x= pi/16 x=3pi/16

a) x=pi/16

u=cosx

v=4x

2u^2 v-1=0

i'm stuck here

Last edited by a moderator:

- #2

jedishrfu

Mentor

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first plugin the x=pi/16 --> 4x = pi/4 and so you have 2 * cos^2(pi/4) - 1 = 0

so what is cos(pi/4)? then square it and solve.

- #3

Mark44

Mentor

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What does this mean? I can think of at least two interpretations. Use parentheses to make the meaning clear.## Homework Statement

2cos^2 4x-1=0

a)x= pi/16 x=3pi/16

## Homework Equations

## The Attempt at a Solution

a) x=pi/16

u=cosx

v=4x

2u^2 v-1=0

i'm stuck here

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