Answer:
C.
Step-by-step explanation:
please mark brainlist 
 
        
             
        
        
        
Step-by-step explanation:
LHS= sin 3x/sin x - cos 3x/cosx
Taking LCM, 
<u>=</u><u>sin3xcosx- cos3xsinx</u>
 sinxcosx
<u>=</u><u>sin(3x-x)</u> 
 sinxcosx
= <u>2sin2x</u>
 2sinxcosx 
=<u> </u><u>2sin2x</u><u> </u>
 sin2x 
=2
= RHS. 
Proved. 
 
        
             
        
        
        
Answer:
 Let selling price of three-piece suit = x. Applying 7% sales tax, total amount paid = x + xx7 - $152.79. 100 207 100 ०१ This is the $ 152.79 os, x- $142.7943 price after marked down of 40%, let the regular price of three-piece suit be = y. Therefore y [ 3 - 4m] $342.1943 1 - - $237.99 Regular price of 1 piece suit $ 237.99 
 
        
             
        
        
        
Answer:
See Below
Step-by-step explanation:
First, isolate x. To do that add 3.5 to each side
x - 3.5 =  -3.1
   +3.5    +3.5
x= 0.4