prove that 2sin2a - 3cos2a - 3sina + 3 = sina(4cosa + 6sina - 3) i am very tired and cant seem to figure it out. would be grateful for any help.
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Hello, sin(2a)=2cos(a)sin(a) cos(2a)=cosē(a)-sinē(a)=(1-sinē(a))-sinē(a)=1-2sinē(a) If you replace these values in the initial expression, you'll get what you want ;-)
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