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Asked Oct 7, 2019
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O TRIGONOMETRIC IDENTITIES AND EQUATIONS
Sum and difference identities: Problem type 1
137T
by using a sum or difference formula.
12
Find the exact value of cos
?
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O TRIGONOMETRIC IDENTITIES AND EQUATIONS Sum and difference identities: Problem type 1 137T by using a sum or difference formula. 12 Find the exact value of cos ?

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Expert Answer

Step 1

Given,

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(- 13TT cos 12 (cos(-)cos(0) cos 12 Зл TT cos 4 3 (cos ) 'Зл sin TT sin = cos Зп = cos 3 sin (3m 2 ) cos (-- - ) - ) sin (п TT 4 2 4 TT sin -cos 4 2

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Step 2

Calculati...

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2/2 2/2 --G 2/2 2/2 1+v3 1+v3 -- 2 2 4

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