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Helga [31]
3 years ago
13

Cos^4 (A/2)- sin^4(A/2)=cosA

Mathematics
1 answer:
pashok25 [27]3 years ago
5 0

Answer:

LHS=cos^4(A/2)-sin^4(A/2)

={cos^2(A/2)}^2 -{sin^2(A/2)}^2

={cos^2(A/2) - sin^2(A/2)}{cos^2(A/2) +sin^2(A/2)}

=cosA×1

=cosA

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4 years ago
Which operations are commutative and associative?
Vadim26 [7]

Answer:

Step-by-step explanation:

if there are two numbers a and b.then

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miv72 [106K]

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Read 2 more answers
Decide whether each expression is equal to 6 x 3/4. Write an X in the table to respond.
Tomtit [17]

Answer:

6 × ¼ is NOT EQUAL TO 6 × ¾

8 × ²/4 is NOT EQUAL TO 6 × ¾

18/(2 × 2) is EQUAL TO 6 × ¾

Step-by-step explanation:

Given 6 * ¾,

We're asked to determine if each of the given expressions is equal or not equal to 6 * ¾.

Let's evaluate 6 * ¾

6 × ¾ = (6×3)/4 = 18/4 = 4.5

Now, let's compare each expression given to determine if it is equal or not

✔️6 × ¼ = (6×1)/4 = 6/4 = 1.5

Therefore,

6 × ¼ is NOT EQUAL TO 6 × ¾

✔️8 × ²/4 = (8×2)/4 = 16/4 = 4

Therefore,

8 × ²/4 is NOT EQUAL TO 6 × ¾

✔️18/(2 × 2) = 18/4 = 4.5

Therefore,

18/(2 × 2) is EQUAL TO 6 × ¾

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3 years ago
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dusya [7]
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