Answer:

Step-by-step explanation:
Given equation is
………………(1)
we use derivative formula 


And also apply 'u v' formula

Differentiating equation (1) partially with respective to 'x' , we treated 'y' as constant.
( here y treated as constant so the derivative of constant function is zero in addition but in multiplication the constant is keep as like 'y').
on simplification , we get

again simplification, we get

taking common '
on left on side , we get

dividing '
on both sides, we get

<u>Final answer</u>:-

1. Answer( -2)
2. Answer is D. 4/3
3. Answer is either A or B
Answer:
its B
Step-by-step explanation:
Answer:
1150
Step-by-step explanation:
a2=a1+d
d=4
sn=(n/2)(2a1+(n-1)d)
s25=(25/2)(2×(-2)+24×4)=25×46=
1150