M141-Chapt3-4

# M141-Chapt3-4 - Ã Ã 1 1 2 3 cos sin tan 3 4 Ã Ã 29 1 1...

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Section 3.4 Sum and Difference Formulas

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Find the exact value of cos15 . °

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7 Find the exact value of cos . 12 π

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19 Find the exact value of sin . 12 π
Find the exact value of cos 40 cos80 sin 40 sin80 . ° °- ° °

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3 If it is known that sin , , and that 5 2 1 5 3 sin , 2 , find the exact value of 5 2 5 π α β = < < = - = - < <
cos sin 2 π θ + = - ÷

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( 29 tan 2 tan π θ - = -

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tan cot 4 4 π θ + =

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Unformatted text preview: - Ã· Ã· 1 1 2 3 cos sin tan 3 4-- +- Ã· Ã· ( 29 1 1 Write cos cos sin as an algebraic expession containing and (that is, without any trigonometric functions). Give the restrictions on and . u v u v u v---...
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## This note was uploaded on 03/01/2012 for the course MATH 141 taught by Professor Nedjlaougouag during the Spring '12 term at City Colleges of Chicago.

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M141-Chapt3-4 - Ã Ã 1 1 2 3 cos sin tan 3 4 Ã Ã 29 1 1...

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