Help!!? Not even sure how to start this question

[wraith ferry]

Q 9a

[gloomy sundial]

so $4 sin\theta cos\theta + 4 sin\theta = cos^2 \theta + cos \theta$

[hard prawn]

ᴰᴱᴬᴰ ★ ᴋɪʟʟᴇʀ ⁰⁴

[gloomy sundial]

$4sin\theta( 1 + cos\theta ) = cos\theta (1 + cos\theta)$

[hard prawn]

ᴰᴱᴬᴰ ★ ᴋɪʟʟᴇʀ ⁰⁴

[gloomy sundial]

so either 1 + cos θ = 0

or 4 sinθ = cos θ

now try

[wraith ferry]

I’m not sure if I have to solve by factorising bc of previous q?

[gloomy sundial]

yep

factors are same

just x and y and here sin and cos

[wraith ferry]

Yeah

Then how do I work out the values from there

[gloomy sundial]

so here

1 + cos θ = 0

cos θ = -1

-1 = cos 180

[wraith ferry]

Oh yeah 😂😂

[gloomy sundial]

ok

[wraith ferry]

I’ll have a go thanks

[gloomy sundial]

ok

[wraith ferry]

Close

[wraith ferry]

How do I close the post? Thanks btw

[gloomy sundial]

.close

[wraith ferry]

.close