Answer:
5 maybe
Step-by-step explanation:
when speaking in difference, it's usually talking about subtraction! so when written down your problem would look like : x - 4 = 9 . (x=5)
Answer:
82
Step-by-step explanation:
1'st step: 
+ 
= 
is the formula for the pythagorean theorem
2'nd step : 
+ 
=
3'rd step: 324+6400 =
4'rd step: 6724=
5'th step: 
=82
6'th step : therefore the value of c is 82 cm
Answer:
B
Step-by-step explanation:
Answer:
#1: -1
#2: 1
Step-by-step explanation:
Anything raised to the 0 power is 1, but in question 1 the negative is outside the parenthesis, so it makes it -1.
Sin2(x) +cos(x)=1
from the relation: (sin2(x) +cos2(x) =1 )
so , sin2(x)=1-cos2(x)
by subs. in the main eqn.
1-cos2(x) + cos(x) =1
by simplify the eqn.
cos(x) -cos2(x)=0
take cos(x) as a common factor
cos(x)* (1-cos(x))=0
then cos(x)=0 && cos(x)=1
cos(x)=0 if x= pi/2
& cos(x) = 1 if x = 0 , 2*pi
so the solution is x= {0,pi/2 , 2*pi}
