Answer:
Step-by-step explanation:
hello : 
cot x + 2cot x  sin x = 0        0≤ x≤ 180
cotx(1+2sinx) =0    means : cotx=0   or  1+2sinx=0
1)  cotx=0   so :  cosx=0  and  sinx ≠ 0   because cotx = cosx/sinx 
when :  0≤ x≤ 180  : x=90°
2) 1+2sinx=0  means : sinx = -1/2
when :  0≤ x≤ 180  : no solutions because  :  sinx ≥ 0
conclusion : one solution : x=90°
 
        
             
        
        
        
Answer:
See explanation.
Step-by-step explanation:
Tyler wrote everything correct, except he multiplied some incorrectly. 2x times 5 is 10x, not 7x. And 3 times 5 is 15, not 8. The bottom left and right boxes are incorrect.
 
        
                    
             
        
        
        
Answer: oh gosh,  rlly bad at math...  let me do the maths quick, and will edit my answer to the correct answer i dont  have enough time, -7a+11
Step-by-step explanation:
 
        
             
        
        
        
Step-by-step explanation:
jsjsjsjshjososnsnxjxjxjxjxjdjdj
 
        
             
        
        
        
The first option,
both have to be negative, because they were originally both part of the one fraction, which was all negative.