A ) cos² x · 1 / sin x - 1 / sin x = - sin x
cos² x - 1 / sin x = - sin x
- sin² x / sin x = - sin x
- sin x = - sin x ( correct )
B ) sin x ( cos x / sin x + sin x / cos x ) = 1 / cos x
sin x · ( cos² x + sin²x ) / sin x cos x = 1 / cos x
sin x · 1 / sin x cos x = 1 / cos x
1 / cos x = 1 / cos x ( correct )
C ) cos² x - sin² x = 1 - 2 sin² x
1 - sin² x - sin² x = 1 - 2 sin² x
1 - 2 sin² x = 1 - 2 sin² x ( correct )
D ) 1/sin²x + 1/ cos²x = 1
cos²x + sin² x / sin² x cos² x = 1
1 / cos² x sin² x = 1
cos²x sin² x ≠ 1
Answer: D ) is not an identity.
1.5 deep.
you subtract 2.25 of air space from the total depth 3.75
3.75-2.25=1.5
Answer:
16 cm squared
Step-by-step explanation:
Assuming the length of the square is x
We get that the length of rectangle is 2x and width is x.
Using formula of area:
32.= 2x * x
32/2 = x * x
16 = x * x
X = 4cm.
So area of squarr is
X * x= 16 cm ^2
Answer:
4.69 in
Step-by-step explanation:
By sine rule:
This is really easy, because 8m is 200% you have to divide it in half to figure out the 100% which is 4... now you have to find the 75%. all you have to do is divide 4 by 25% which is 3.
