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)

How to draw graph with two variables

What is the formula to calculate the sum of the series

find the sum of gp 2,-1/2,1/8,...........,n,12 term

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

pls send the answers

Solve for x and y
5/x+1/y=2
6/x-3/y=1

x and y not equal to zero

physics

prove a+b2

=a2+2ab=b2

if a and b are unit vectors then what is the angle between a and b for a-2b to be unit vector 

There is no some easy method to understand