SOLUTION: I am super confused with this type of questions. I would be grateful for your help. Thanks in advance.
A) if 0<x<π /2 and tan x = 15/8, cos 2x=
B) if sin x= 0.2, find cos
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Question 333611: I am super confused with this type of questions. I would be grateful for your help. Thanks in advance.
A) if 0
B) if sin x= 0.2, find cos 2x
C)find sin 7π /12; how to I get here: (1+√3)/2√2
D) use π /12=(π /3)-(π /4) to find cos π /12
THANK YOU!!!!!!!!!!
Answer by Alan3354(69443) (Show Source): You can put this solution on YOUR website!
A) if 0
What?
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B) if sin x= 0.2, find cos 2x
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sin(2x) = 2sin(x)cos(x)
=
cos(2x) = 0.92
---------------
Repost the others, don't post several problems at one time. The tutors are much more likely to ignore them if you do.
--------------------
C)find sin 7π /12; how to I get here: (1+√3)/2√2
D) use π /12=(π /3)-(π /4) to find cos π /12
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