Finding all Real and Complex Solutions of a Trigonometric Equation

This is a great question for testing knowledge of finding real and complex solutions to trigonometric equations. It starts off fairly gently finding the real solutions, but then the complex solutions require solving the equation (cos x)^2 +2 = 0. Whilst solving this second part, we mention a similar Gresty Academy video, namely 'How to Find all Complex Solutions of cos (z) = 3' which can be found at • How to Find all Comple... and which is worth watching alongside this video.
For more practice with complex number questions see our playlist 'Complex Numbers' at • Complex Numbers

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For more videos on complex numbers check out the Gresty Academy playlist 'Complex Numbers' at ua-cam.com/play/PLlX3COjsHPVC9MnNSwdVOfFk6zALYYEAm.html