How to verify identities using sum and difference?

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02-03-2017
Mathematics

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How to verify identities using sum and difference?

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kaitlynj3481 kaitlynj3481 · Answer 1 · 2017-03-02T22:56:05+01:00

kaitlynj3481 kaitlynj3481

02-03-2017

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.

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