Verify the Identity $$\frac { \tan ^ { 2 } x } { \sec x + 1 } = \frac { 1 - \cos x } { \cos x }$$

question 20

Multiple Choice

Verify the identity. $$\frac { \tan ^ { 2 } x } { \sec x + 1 } = \frac { 1 - \cos x } { \cos x }$$

• A) valid
• B) invalid

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Definitions:

Fluke

Parasitic flatworms that belong to the Trematoda class, often causing diseases in livestock and humans.

Convergent Evolution

The process where organisms not closely related independently evolve similar traits as a result of having to adapt to similar environments.

Natural Selection

A fundamental mechanism of evolution where organisms better adapted to their environment tend to survive and produce more offspring.

Homologous Traits

Traits shared by two or more species that were inherited from a common ancestor.