sir/mam this is a question4 of maths class 11 ch-10 miscellaneous exercise. Can you please tell me why my answer is not coming? And where am I going wrong in this?

• Sir can u give me another solution of class 12th chapter 7 and exercise 7.4 question number 15 in another way I can not understand this solution of questions number 15 please give another way of this question thanks and have a nice day
  

Find dy/dx if y= log(-sinx)/(+sinx)

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i think it is salary received from employer is taxable???

ABCD is a parallelogram if the coordinate of A B C D are 2,3 1,4 and o,-2 find the coordinate of D

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