Answer:
-90 , 30
Step-by-step explanation:
sina = cos(2a)
= 1 - 2(sina)^2
2(sina)^2 + sina -- 1 = 0
( sina + 1 )( 2sina - 1 ) = 0
sina = -1 or sina = 1/2
=> a = -90 degrees or => a = 30 degrees
and you graph it from -4 to the right with close circle
Hope this help
Yes
I had this exact question.
well?
Answer: b
Step-by-step explanation: since i helped can i have brainlist please :D
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