If you could help with these thanks! #1) 2sin^2X=sinX #2) cosX=sinX #3) tanX+secX=1
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Originally Posted by amanda0603 #1) 2sin^2X=sinX set each factor equal to 0 and solve for x #2) cosX=sinX solve this one by looking at your unit circle #3) tanX+secX=1 square both sides ... solve for x .
Originally Posted by skeeter . Alternatively for #2, divide both sides by to give . Solve for .
Originally Posted by Prove It Alternatively for #2, divide both sides by to give . Solve for . o.k. in this particular equation, but not always a good idea in general as may be a possible solution in another equation.
Originally Posted by amanda0603 If you could help with these thanks! #1) 2sin^2X=sinX #2) cosX=sinX #3) tanX+secX=1 #1) 2sin^2x = sinx 2sin^2x - sinx = 0 sinx (2sinx - 1) = 0 sinx = 0 x = 0, 180, 360 2sinx - 1 = 0 2sinx = 1 sinx = 1/2 x = 30, 150 0verall: 0, 30, 150, 180, 360 #2) cosx = sinx cosx - sinx = 0 1 - tanx = 0 tanx = 1 x = 45, 225
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