How do you use a calculator to evaluate #sin(-0.65)#?

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Apr 1, 2017

Answer:

#-40^@54, 220^@54#

Explanation:

sin x = - 0.65
Calculator gives -> - 0.65 --> 2nd --> sin -->
x = - 40^@54
Unit circle gives another x that has the same sin value:
#x = 180 - (-40.54) = 220^@54#

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