How to verify identities using sum and difference?

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asked Mar 22, 2018 203k views

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Vygintas B · Answer 1 · 2018-03-26T22:25:03+0000

use a sum or difference identity to find the exact value of cos without a calculator. to work this, we look at the 75° to see if its the sum or difference of any angles from our reference triangles.now plug in values from your reference triangles.

How to verify identities using sum and difference?

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