Important Points to be Remembered : This lecture is to make you aware that one cannot afford to be careless while dealing with trig. equation’s. By understanding the meaning of extraneous & lost roots and learning the strategies to combat them we’ll be able to safeguard ourselves from obtaining wrong or incomplete solutions of trigonometric equations.
Important points to be remembered, Mathematics online video lecture for IIT-JEE and CBSE students by the best faculty in India.
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She teaches so well..I found her explanation very elaborative
Finally I found a good video on trigonometric equation