sinx – 7cosx =7,
2sin2x-2cos2x=căn 2,
sin8x-cos6x= căn 3 nhân ( sin6x+cos8x)
căn 3.sin2x+cos2x= căn 2. cosx-căn 2sinx
sinx – 7cosx =7, 2sin2x-2cos2x=căn 2, sin8x-cos6x= căn 3 nhân ( sin6x+cos8x) căn 3.sin2x+cos2x= căn 2. cosx-căn 2sinx
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sinx – 7cosx =7,
2sin2x-2cos2x=căn 2,
sin8x-cos6x= căn 3 nhân ( sin6x+cos8x)
căn 3.sin2x+cos2x= căn 2. cosx-căn 2sinx