Verify That the Equation Is an Identity $$\sin \left( x + \frac { \pi } { 2 } \right) = \cos x$$

question 26

Essay

Verify that the equation is an identity.
- $$\sin \left( x + \frac { \pi } { 2 } \right) = \cos x$$

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Definitions:

Anal Stage

The Anal Stage is the second stage in Freud's psychosexual development theory, occurring from about 18 months to 3 years of age, where children find pleasure in controlling bladder and bowel movements.

Latency Stage

In Freudian theory, a period during childhood development following the phallic stage, where sexual urges are repressed and dormant as children focus on other aspects of life.

Puberty

The developmental stage in humans during which children develop secondary sexual characteristics and reach sexual maturity.

Personality

The combination of characteristics or qualities forming an individual's distinctive character and behavioral patterns.