Find all the angles θ between -π to π that satisfy the equation 5 cos 2θ + 2 cos^2 θ/2 + 1 = 0? The given answer includes + or - π/6, π - cos^-1 3/5 and -π + cos ^-1 3/5. My own answers are not matching. Please help!
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Hello, Originally Posted by fardeen_gen Find all the angles θ between -π to π that satisfy the equation 5 cos 2θ + 2 cos^2 θ/2 + 1 = 0? The given answer includes + or - π/6, π - cos^-1 3/5 and -π + cos ^-1 3/5. My own answers are not matching. Please help! --> -----> Going back to the equation : But ---> Substitute and you're done If you still can't get to the solution, show your working
Thanks moo. There is some problem with either my computer or the forum.I did not double post voluntarily. An extra post appeared earlier also with no fault of my own. Mods please take notice!
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