Decide Whether the Expression Is or Is Not an Identity $$\sqrt { 1 - \cos ^ { 2 } x } = 1 - \cos x$$

question 120

Multiple Choice

Decide whether the expression is or is not an identity.
- $$\sqrt { 1 - \cos ^ { 2 } x } = 1 - \cos x$$

• A) Identity
• B) Not an identity

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Definitions:

Photosynthesis

The process by which green plants and some other organisms use sunlight to synthesize nutrients from carbon dioxide and water.

Sediment

consists of solid particles, often minerals or organic matter, that settle to the bottom of a liquid, commonly found in bodies of water such as rivers, lakes, and oceans.

Suspended Matter

Particles floating within a liquid or gas that have not settled to the bottom, which can include organic and inorganic materials affecting water quality and clarity.

Coliform Bacteria

A group of bacteria predominantly found in the intestines of warm-blooded organisms and in their waste, used as an indicator of sanitary quality of water and food.