Question

Please somebody help me!!!
I have to use double angle identity to fill in the missing information.

cos350degrees= 1-2______________

Answer 1

\[\Large\bf\sf \cos2 \color{royalblue}{\theta}\quad=\quad 1-2\sin^2\theta\]
\[\Large\bf\sf \cos(350)\quad=\quad \cos(2\cdot \color{royalblue}{175})\]

Answer 2

Understand how to apply the identity after we split the angle like that?

Answer 3

Really, thank you i had this answer but i doubted myself. I appreciate it

Answer 4

Oh ok cool :) Also,

\(\Large\bf \color{#008353}{\text{Welcome to OpenStudy! :)}}\)

Answer 5

so would the answer be 1-2sin^2175degrees
Thank for the warm welcome

Answer 6

ya looks good!

Answer 7

can I ask a little more please because my teacher went too fast for me to catch the concept

Answer 8

k

Answer 9

Oh thank you

this is tricky
tan(x + pi/4)= (1+tanx)/(1-tanx)

Answer 10

Solve for x?

Answer 11

I have to prove the one side equals the other

Answer 12

Oh oh ok :)

Answer 13

Here is your `Additive Identity for Tangent`\[\Large\bf\sf \tan(\alpha+\beta)\quad=\quad \frac{\tan \alpha+\tan \beta}{1- \tan \alpha \tan \beta}\]

\[\Large\bf\sf \tan\left(x+\frac{\pi}{4}\right)\quad=\quad \frac{\tan x+\tan \frac{\pi}{4}}{1- \tan x \tan \frac{\pi}{4}}\]

Answer 14

Do you remember your unit circle for tangent(pi/4) ? :)

Answer 15

sqrt2/2

Answer 16

Nooo silly.
That's what sine and cosine give us (each of them).

Answer 17

Tangent is sine/cosine.

Answer 18

oh my bad

Answer 19

we barely praticed tangent im kinda new to it sorry

Answer 20

tangent = y/x