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4 years ago

Simplify the expression by using a double-angle formula or a half-angle formula. (a) cos2 θ 2 − sin2 θ 2

1 answer:

6 0

If this is supposed to be
$cos^{2}θ-sin^{2}θ$
Then this can simply be reduced to
$cos2θ$
by the double angle formula for cosine

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Y= what ? Need help ASAP

lana66690 [7]

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4 years ago

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2x + 5y = -5<br> x + 3y = 3<br><br> Find the solution to the system algebraically

Karolina [17]

Answer:

-2y=-5x=3

Step-by-step explanation:

Make sure every variable is on one side of the equation and you get the answer.

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3 years ago

I am thinking of a five-digit number where the fifth digit is one-half the fourth digit and one-fourth the third digit. the thir

Natasha_Volkova [10]

solution:

Let the number be ABCDE

>>The second digit is three times the fourth digit<<

So D is 1,2, or 3 and B is 3,6 or 9.

The number is A3C1E, A6C2E, or A9C3E

>>The second digit is ... five more than the fifth digit.<<

That rules out 3 for B, so B is 6 or 9, and D is 2 or 3.

It also tells us that E is 1 or 4, so that B can be 5 more than it.

So the number is A6C21 or A9C34

>>The third digit is ... twice the fourth digit<<

So C is twice D, which is 2 or 3. So C is 4 or 6

So the number is A6421 or A9634

>>The third digit is one-half the first digit

So C is 4 because 6 is too large to be half a digit. And so

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3 years ago

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melomori [17]

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Step-by-step explanation:

I've taken the same test

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3 years ago

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ValentinkaMS [17]

Answer:

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Step-by-step explanation:

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3 years ago