9000086706 | math4u.vsb.cz

SubArea:

Trigonometric equations and inequalities

Level:

Project ID:

9000086706

Accepted:

1

Clonable:

0

Easy:

1

Identify the equation which arises from the following equation using an optimal substitution.

2 \cos^{2} x - 7 \cos x + 3 = 0

2 t^{2} - 7 t + 3 = 0

2 t^{2} = \frac{3}{7}

\cos t = 0

7 \cos t = 3