Class 12th

Q) Find , if Ans:  Given Taking log both sides log = log Since log (a) b = b. log a ∴ y log (cos x) = x log (cos y) Differentiating both sides w.r.t. x (y log cos x) = (x log cos y) . log cos x + . y  = . log […]

Q) Find the co-ordinates of the foot of the perpendicular drawn from the point (2, 3, – 8) to the line (4 – x)/2 = y/6 = (1 – z )/3Also, find the perpendicular distance of the given point from the line. On the basis of the above information, answer the following questions :(i) Write

Q) A rectangular visiting card is to contain 24 sq.cm. of printed matter. The margins at the top and bottom of the card are to be 1 cm and the margins on the left and right are to be 1½ cm as shown below : On the basis of the above information, answer the following questions

Q) A departmental store sends bills to charge its customers once a month. Past experience shows that 70% of its customers pay their first month bill in time. The store also found that the customer who pays the bill in time has the probability of 0.8 of paying in time next month and the customer who

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