If sin a- 4/5, what is cos B? O 5/4 O 3/5 O 4/5 O not enough information

Trigonometry (MindTap Course List)
8th Edition
ISBN:9781305652224
Author:Charles P. McKeague, Mark D. Turner
Publisher:Charles P. McKeague, Mark D. Turner
Chapter5: Identities And Formulas
Section5.4: Half-angle Formulas
Problem 13PS: If 270A360, then is cos(A/2) positive or negative?
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If sin a= 4/5, what is cos 8?
O 5/4
O 3/5
O 4/5
O not enough information
Transcribed Image Text:If sin a= 4/5, what is cos 8? O 5/4 O 3/5 O 4/5 O not enough information
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