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I got that. The system isn't taking the answer in any form...

wait :D i didn see this - \[0<\theta <90\]

that means that the angle theta lies between 0degrees and 90 deegrees

Yes ?
I don't know what that applies to my answer lol, don't know how to

hav u tried this-
\[2\cos \theta\]

tried that as the answer?

http://prntscr.com/8ft6av?

?

I mean\[\pm2\left|\cos\theta\right|\]

yea

I don't get it.
See, I got this one right without issues. http://prntscr.com/8ft75p

Maybe they are negative?

I can't risk the attempt though, got to make sure. :S

:) if they r not accepting positive then no scope for negative

maybe theres some error in their server

Sadly I tried it before, doesn't register as a trig function if I do that

que?

i would try \( 2| \cos \theta| \) for 1st
and \(3\tan \theta \) for 2nd

i mean \(3 |\tan \theta |\)

its definitely not \(\pm\)
the answer to a \(\sqrt{...}\) is always a positive

yes maybe it doesn't accept because of that bracket u put :P http://prntscr.com/8ftchw

The coding comes with the bracket. @imqwerty I cannot remove that. I have tried that.

@hartnn I was taught that there are two types of signs to a square root? I mean (-)(-)=+ right?

u must consult ur teacher

ehhh.
I have done that?

lol

is this flvs? maybe u get the solution to this issue on google :)

and \(\sqrt a\) is just one of them, and it can never be negative

????????

Ah my question key die from pressing too much LOL x_x!

was just trying to explain why sqrt a can never be negative

so u got the 1st one wrong ....did it tell u the correct answer afterwards?

...My computer is very laggy right now

:)

go for \(3|\tan \theta |\) !

...Fine, I blame you guys if I fail the question lol

http://prntscr.com/8ftleb
... @hartnn it's wrong.

I don't get iiiit! D:

The teacher said the answer must be a|cos theta| format

it needs to have cos in ti ??

no that is an example trig function

sec^2 x = 1/cos^2 x

LOL

3 | tan \(\theta \)| is indeed in that format

Yeah idk why they say it's wrong. This question have the right formathttp://prntscr.com/8ftnwx

@hartnn \[\sin10=\cos{?}\]

10 degree

Wait never mind

I got it

sin x = cos(90-x)
here x = 10
whats 90 -10 ?

ok

lolol sorry

no problem :)

But I don't get the formatting of those problem, confusing D:

@hartnn ? ?

whats the Def II?
they are asking why tan 90n goes to infinity or -infinity

Yes.
And I got wrong answer here too LOL very sorry
(8 cos 30°)2 I put 96 is wrong

^2 sorry not x2

cos 30 = sqrt 3/2
8 cos 30 = 4 sqrt 3
its square
16*3 = ...

:o
Oh um um um

UM.... 48?!

yes

lol! I got it :D

Thank you ! :]

welcome ^_^

But... what about the weird question? Do I just skip it for now? o-o

take 2nd opinion...
maybe ask some other expert
or you can skip it, if you're not in any hury

Okay.

@hartnn Sorry question: http://prntscr.com/8ftxg2 ?

cos 30 = sqrt 3/2
cos^2 30 = 3/4
4cos^2 30 = 3

6 sin 30 = 6/2 =3

finally, 3+3 =6

o_o Oh.

So I should not do it the quadratic formula way yes?

Too complex? lol

you can, but that not required, because we know the values already

ah ok. got it

−5 sin 2x if x = 30, how much?
I don't know how to do a sin b x

x = 30,
so 2x = 60
sin 60 = sqrt 3/2
so -5 sqrt 3/2

OOOOOOH okay! Thank you :)

Umm last one, this really confusing me http://prntscr.com/8fu4ew?

tan is opposite/adjacent so it has to be the 1st one only

Ohhh okay my brain is too tired to process right, thank you so much lol

I gonna close this now

sure, welcome ^_^

:D

@imqwerty what?