Expansions, Trigonometry, and Trigonometric Ratios Quiz

$a^2 + b^2$

$a^2 + 2ab - b^2$

$a^2 - 2ab + b^2$

$a^2 + 2ab + b^2$ (correct)

Tangent

Cosine

Cosecant

Sine (correct)

$\frac{1}{\sqrt{2}}$

$\frac{\sqrt{3}}{2}$ (correct)

$\frac{\sqrt{2}}{2}$

$\frac{1}{2}$