Question

1+Sinx/n=7. Prove that

Answer 1

sinx/n+1 = 7 

sinx = 7n+7 

we know that the range of sinx is from -1 to 1 
so 7n+7 also lies in between -1 and 1. 

-1<= sinx <=1 

-1<=7n+7<=1 

subtracting 7 on both the sides 

-8<=7n<= -6 

dividing 7 on both the sides 

-8/7<=n<= -6/7 

now multiplying - sign on both the sides, so the 
equality sign changes 

8/7>=n>=6/7 

hope u understand

Answer 2

1 +  sin x =7n
sin x=7n -1 
therefore, sin x is equals to
7n- 1