Use Identities to Find the Exact Value $\cos \left( - 75 ^ { \circ } \right)$

question 418

Multiple Choice

Use Identities to find the exact value.
- $\cos \left( - 75 ^ { \circ } \right)$

• A) \(\frac { \sqrt { 6 } - \sqrt { 2 } } { 4 }\)
• B) \(- \sqrt { 6 } - \sqrt { 2 }\)
• C) \(\frac { \sqrt { 2 } - \sqrt { 6 } } { 4 }\)
• D) \(\sqrt { 2 } - \sqrt { 6 }\)

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Definitions:

Syntax

The set of rules, principles, and processes that govern the structure of sentences in a given language.

Morphology

The study of the forms and structures of things, in linguistics focusing on the formation and structure of words, and in biology the structure and form of organisms.

Phonemes

The tiniest sound element in a language that can differentiate one word from another.

Morphemes

The smallest units of language that carry meaning, including prefixes, suffixes, and root words.