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# Post1330_6o1 - 9 sin 10 sin 9 cos 10 cos Section 6.1 – Sum and Difference Formulas 2 Example 2 Find the exact value of each of the following a 12

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Section 6.1 – Sum and Difference Formulas 1 Section 6.1 Sum and Difference Formulas Important: sin( ) sin sin A B A B + + cos( ) cos cos A B A B + + Addition Formulas sin( ) sin cos cos sin cos( ) cos cos sin sin sin( ) sin cos cos sin cos( ) cos cos sin sin A B A B A B A B A B A B A B A B A B A B A B A B + = + + = - - = - - = + B A B A B A tan tan 1 tan tan ) tan( - + = + B A B A B A tan tan 1 tan tan ) tan( + - = - Reduction Formulas cos sin sin cos 2 2 π θ - = - = These are just the complementary angle identities ( and 2 - are complementary angles). Example 1: Simplify a. sin sin 3 3 + + - . b. -

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Unformatted text preview: 9 sin 10 sin 9 cos 10 cos Section 6.1 – Sum and Difference Formulas 2 Example 2: Find the exact value of each of the following. a. 12 7 sin π b. 12 31 cos Section 6.1 – Sum and Difference Formulas 3 Example 3: Suppose 7 sec 3 θ = -and 3 2 π < < . Suppose 1 sin 4 α = and 2 < < . Find ) cos( + ....
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## This note was uploaded on 02/20/2012 for the course MATH 1330 taught by Professor Staff during the Fall '08 term at University of Houston.

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Post1330_6o1 - 9 sin 10 sin 9 cos 10 cos Section 6.1 – Sum and Difference Formulas 2 Example 2 Find the exact value of each of the following a 12

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