1003076712 | math4u.vsb.cz

SubArea:

Sine, cosine, tangent and cotangent

Level:

Project ID:

1003076712

Accepted:

1

Clonable:

0

Easy:

1

Let

\sin x = a

and

\cos x = b

. Then

\cos (2 x)

is equal to:

b^{2} - a^{2}

2 b

2 a b

a^{2} - b^{2}