4 years ago

Simplify (sinx - cosx) (sinx + cosx)

1 answer:

6 0

[sin(x) - cos(x)][sin(x) + cos(x)]
sin(x)[sin(x) + cos(x)] - cos(x)[sin(x) + cos(x)]
sin(x)[sin(x)] + sin(x)[cos(x)] - cos(x)[sin(x)] - cos(x)[cos(x)]
sin²(x) + sin(x)cos(x) - sin(x)cos(x) - cos²(x)
sin²(x) - cos²(x)
-cos(2x)

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Plz help this is from Khan academy ty!!

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sergey [27]

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see below

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