Posted by **Bernice** on Monday, December 14, 2009 at 2:16pm.

Determine the amplitude of: y=-2sinx

- Math, not "adult education" -
**Writeacher**, Monday, December 14, 2009 at 3:16pm
Assistance needed.

Please type your __subject__ in the **School Subject** box. Any other words are likely to delay responses from a teacher who knows that subject well.

- Trigonometry -
**MathMate**, Monday, December 14, 2009 at 11:59pm
A typical trigonometric function such as

f(x) = a sin k(x-φ)

has the following definitions:

amplitude = |a|, or the absolute value of a

period = 2π/k

phase shift = φ

For example,

y = 3 sin 2(x-π/4)

has an amplitude of 3, period of 2π/2=π, and phase shift of π/4 to the right.

So for y = -2 sin x,

the amplitude would be |-2| = 2.

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