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

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.
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 ?
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.
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

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