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Eric Martindale · Answer 1 · 2021-01-16T03:59:06+0000

Answer:

- 1

Explanation:

Using the trigonometric identity

cos(- x) = cosx and exact value cos60° =
(1)/(2)

Given

f(x) = - 2cosx , then

f(- 300° )

= - 2cos(- 300)°

= - 2cos(300)°

= - 2cos(360 - 300)°

= - 2cos60°

= - 2 ×
(1)/(2)

= - 1

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