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skelet666 [1.2K]
4 years ago
7

Please help me idk how to solve it.

Mathematics
1 answer:
SVEN [57.7K]4 years ago
4 0
(sinФ-cosФ)^2-(sinФ+cosФ)^2

sin^2Ф+cos^2Ф-2sinФcosФ-(sin^2Ф+cos^2Ф+2sinФcosФ)
1-2sinФcosФ-1-2sinФcosФ
we know sin^2Ф+cos^2Ф=1

-4sinФcosФ
answer is A
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Multiply (3a + 5)2<br>A9a2 + 30a + 25<br>B 25a2 + 15a + 9<br>C a2 + 3a + 25<br>D 5a2 + 15a + 9​
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Answer:

9 a^2 + 30 a + 25 the anwser is A

Step-by-step explanation:

Expand the following:

(3 a + 5)^2

(3 a + 5) (3 a + 5) = (3 a) (3 a) + (3 a) (5) + (5) (3 a) + (5) (5) = 9 a^2 + 15 a + 15 a + 25 = 9 a^2 + 30 a + 25:

Answer: 9 a^2 + 30 a + 25

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