# [C2] Finding Cos of an angle from it's Sin fraction?Watch

Thread starter 5 years ago
#1
I'm really struggling with these questions, and can't find any help as to how to actually solve them (as in the method).

Could anyone help me out please?

Examples of questions -

Thanks,
Cameron.
0
quote
5 years ago
#2
(Original post by c3ntury)
I'm really struggling with these questions, and can't find any help as to how to actually solve them (as in the method).

Could anyone help me out please?

Examples of questions -

Thanks,
Cameron.

How can you use this to find given ?
1
quote
5 years ago
#3
The way i do is by using the Triangle .

say Sin x = 12/13

Sin of an angle : is opposite/Hypotenuse

so it is 12 / 13

now If you look for Cos x we need to use the triangle

Look at the picture drawn to you.
1
quote
5 years ago
#4
(Original post by charly2012)
The way i do is by using the Triangle .

say Sin x = 12/13

Sin of an angle : is opposite/Hypotenuse

so it is 12 / 13

now If you look for Cos x we need to use the triangle

Look at the picture drawn to you.
Just to add, if its acute the answer will be positive but obtuse means it depends on whether its sin or cos
1
quote
X

new posts

Latest
My Feed

### Oops, nobody has postedin the last few hours.

Why not re-start the conversation?

see more

### See more of what you like onThe Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

### University open days

• University of Lincoln
Mini Open Day at the Brayford Campus Undergraduate
Wed, 19 Dec '18
• University of East Anglia
UEA Mini Open Day Undergraduate
Fri, 4 Jan '19
• Bournemouth University
Wed, 9 Jan '19

### Poll

Join the discussion

Yes (199)
27.64%
No (521)
72.36%