### Home > PC3 > Chapter 2 > Lesson 2.2.1 > Problem2-55

2-55.

Reminder: $(\sin(θ))^2$ is usually written as $\sin^2(θ)$. Also, $\sin(θ^2)$ means to square $θ$ first and then take the sine. If $\sin(θ)=0.6$ and $\frac{\pi}{2}\leθ\le\pi$ , evaluate the following expressions or state “impossible without a calculator.”

1. $(\sin(θ))^2$

$(0.6)^2$

1. $\sin^2(θ)$

This expression is another way to write the expression given in part (a).

1. $\sin(θ^2)$

The value of $θ$ needs to be determined first, then squared.