4.3 Cofunction Identities
4.3 Cofunction and Reduction Identities
Reduction Identities
Who can figure out how to memorize this table????
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4.3 Cofunction Identities
Simplify
sin (­25o)
[­csc(­100o)]3
Cofunction Identities
2
4.3 Cofunction Identities
Rewrite in terms of its cofunction
sin 70o
tan 88o
Rewrite as a positive acute angle
tan 220o
csc(­185o)
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4.3 Cofunction Identities
Given that sin 17o = 0.292 find sin 73o
Given that cot(-411o)=-0.810, find cot 4110
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4.3 Cofunction Identities
Assignment
Page 155, Exercise 4.3
#1 , 2, 3, 7
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