Find the Expression as the Sine or Cosine of an Angle.​

question 34

Multiple Choice

Find the expression as the sine or cosine of an angle.​ $$\cos 9 x \cos 5 y + \sin 9 x \sin 5 y$$ ​

• A) \(\sin ( 5 x - 9 y )\)
• B) \(\sin ( 9 x - 5 y )\)
• C) \(\cos ( 5 x - 9 y )\)
• D) \(\cos ( 9 x - 5 y )\)
• E) \(\cos ( 9 x + 5 y )\)

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Definitions:

Emotion-Eliciting Tendencies

The predisposition of certain situations or stimuli to evoke specific emotional responses.

Neutral Emotional State

A condition where an individual feels neither positive nor negative emotions, often described as feeling emotionally flat or indifferent.

Flow-Inducing Activities

Tasks or actions that fully immerse and engage an individual, leading to a sense of euphoria and focus, often resulting in high levels of personal satisfaction and productivity.

Chores

Routine tasks or jobs that need to be done regularly, often referring to household activities.