Prove the Identity $$\sec \left( \frac { \pi } { 2 } + u \right) = - \csc u$$

question 291

Essay

Prove the identity.
- $$\sec \left( \frac { \pi } { 2 } + u \right) = - \csc u$$

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Definitions:

18th Century

The period from 1701 to 1800 in the Gregorian calendar, marked by significant events such as the Enlightenment, the Industrial Revolution, and the American Revolution.

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Boomerang Effect

A phenomenon where an attempt to change beliefs or attitudes does the opposite, reinforcing pre-existing beliefs.

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