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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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