Answer:
Proven . We get a true statement of 1 = 1 by transforming the expression on the left side to make it look like the right side. See below.
Step-by-step explanation:
This is missing some notation: Sin^4x+2cos^2x-cos^4=1
We want to prove : (Sin x ) ^ 4 + 2 (cos x)^2 - (cos x)^4 = 1
Replace the (cos x)^4 with ((cos x)^2)^2 same with the (sin x)^4 with
((sin x)^2)^2
(Sin x ) ^ 4 + 2 (cos x)^2 - (cos x)^4 = 1
( ((sin x)^2) ^2 - ( (cos x)^2)^2 + 2 (cos x)^2 + 1 - 1 = 1
Factor the trinomial -((cos x)^2)^2 + 2 (cos x)^2 + 1 .
considering ((cos x)^2) is the variable
( ((sin x)^2) ^2 - ( (cos x)^2)^2 + 2 (cos x)^2 - 1 + 1 = 1
( ((sin x)^2) ^2 + [- ( (cos x)^2)^2 + 2 (cos x)^2 - 1 ] + 1 = 1
( ((sin x)^2) ^2 - [ ( (cos x)^2) - 1 ]^2 + 1 = 1
But also notice that (sin x)^2 = 1 - (cos x)^2 from the trig identity:
(sin x)^2 + (cos x)^2 = 1
( (1 - (cos x)^2) ^2 - [ ( (cos x)^2) - 1 ]^2 + 1 = 1
here we see that (1 - (cos x)^2) ^2 = [ ( (cos x)^2) - 1 ]^2
so we get ( 0 + 1) = 1
1 = 1 true.
Proven . We are done proving this identity because we get a true statement.
Answer:
you need 2 cups of sugar
Step-by-step explanation:
1/2 cups of sugar = 3/4 cup of flour
x = 3 cups of flour
1/2*3 = 3/4x
3/2 = 3/4x
x =3/2 ÷ 3/4
x =2
Answer:
5 + (-3)
Step-by-step explanation:
there are 5 positives and 3 negatives
so when you add them together you get 5 + (-3)
Answer: B
Step-by-step explanation: the values start from zero to higher
