2 Questions, will award medals to first who answers correctly

Question

anonymous · Answer

attachment

anonymous · Answer

@nincompoop @jinxhead20 @beccaboo333 @Destinymasha @e.mccormick @Hero @jigglypuff314 @ParthKohli

beccaboo333 · Answer

I'd help if I were good with math ._.

anonymous · Answer

I think the answer to the first one is C and the answer to the second one is B, am I right?

dan815 · Answer

expand and simplify

anonymous · Answer

Not sure can you help?

dan815 · Answer

give me a second ill give you a video on how to expand

dan815 · Answer

dan815 · Answer

(x+y)^2=x^2+2xy+y^2

anonymous · Answer

Don't know how to use the foil method with cosine, sine, and thita

dan815 · Answer

(x+y)^2=(x+y)(x+y)=(x+y)x + (x+y)(y)

dan815 · Answer

oh dont let that stuff confuse you lol

dan815 · Answer

just sub x= cos x
and       y = sin x
and solve it like you normally do and sub cos and sin in the end if that help you

anonymous · Answer

I tried it on my graphing calculator and got a wave

dan815 · Answer

can you please expand it

dan815 · Answer

use the method im giving you, sub in for cos x and sin x with x and y and simplify

anonymous · Answer

Help please

anonymous · Answer

Got them all wrong, been online for hours and nobody has been explaining it full to be, they just leave in the middle but fine.