Starring Randhir Kapoor,Sanjeev Kumar(D.R.),Rajendra Nath, Poonam Dhillon,Yogita Bali,Simi
Director Rahul Rawal
Music Director R.D.Burman
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The fallacy Jayasankar sir brugoht to our notice is a typical one. We often forget to choose the appropriate sign while taking square roots. Of course we have (cos x)^2 = I (sin x)^2. It only means cos x = [(1 sin^2 x)^1/2] or -[(1 sin^2 x)^1/2]. It is not always necessary that both the solutions are equally valid. We need to check them separately. In the present case cos x = -[(1 sin^2 x)^1/2]. Generally speaking the equation x^2 r^2 = 0 has two solutions, namely x = +r and x = -r; but which solution is relevant in the context is to be noted with care.
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