trigonometry

[wicked willow]

D is 108

E is 68

[fickle night]

Can you write down the entire process of your calculation?

[wicked willow]

I minus the big angle from the two angles

I put cos -1 and then

Put 74÷

[hybrid kraken]

Part d)
Use cosine rule
Angle WYU=(
cos‐¹( 13²+9²-18²/2×9×13)

[wicked willow]

I did do that

@hybrid kraken

That's the wrong answer though

That's 71

It says it's 100

[hybrid kraken]

Isn't the answer 108?

I'm getting 108

To part d

[wicked willow]

I got

72

So idk

Can you write it down cause idk what I am doing wrong

[wicked willow]

Yeah I don't get that

I already did it even

That's the numbers I put before

[hybrid kraken]

Maybe it's a calculator setting