The Student Room Group
Whoops. Already posted this elsewhere. Thanks anyway.
Reply 2
danbo600roboguy
Hello. I've lost some of my notes so I need help solving the following equation in radians:

8sin^2 x + 2cos x = 5

Any help greatly appreciated.


Try replacing the sin squared with cos squared.
Reply 3
8(1-cos^2x)+2cosx=5

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