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MATH / Simplify cos54^(∘)cos4^(∘)−cos36^(∘)cos86^(∘).

Problem

Answer published by the source. Consult the official source to check your work against its answer.

problem

Simplify cos54∘cos4∘−cos36∘cos86∘.\cos 54^\circ \cos 4^\circ - \cos 36^\circ \cos 86^\circ. Enter your answer is a trigonometric function evaluated at an integer, such as "sin 7". (The system will assume that the angle is in degrees.)
Plain-text mathematical notation (without MathML)
Simplify cos54^(∘)cos4^(∘)−cos36^(∘)cos86^(∘).

Enter your answer is a trigonometric function evaluated at an integer, such as "sin 7".  (The system will assume that the angle is in degrees.)
Original LaTeX notation
Simplify $\cos 54^\circ \cos 4^\circ - \cos 36^\circ \cos 86^\circ.$

Enter your answer is a trigonometric function evaluated at an integer, such as "sin 7".  (The system will assume that the angle is in degrees.)

level

Level 2

type

Precalculus

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Source and history

task_id
13b1f499-cf35-57c2-b0ab-9823ffcc1f68
task_key
precalculus--test--13b1f499-cf35-57c2-b0ab-9823ffcc1f68
task_revision_id
1
config / split
precalculus / test

Official source

initial import