kristencrum21 kristencrum21
  • 25-03-2020
  • Mathematics
contestada

Verify that (sinx-cosx)2 = 1 - 2 sin xcosx is an identity.

Respuesta :

bhuvna789456
bhuvna789456 bhuvna789456
  • 30-03-2020

[tex](sin x - cos x)^{2} = 1 - 2 sin x cos x[/tex]

Step-by-step explanation:

Step 1 : Taking L.H.S(Left Hand Side) we have,

[tex](sin x - cos x)^{2} = sin^{2} x + cos^{2} x - 2 sin x cos x[/tex]                       ... equation (1)    

Step 2 : As we know, [tex]sin^{2} x + cos^{2} x = 1[/tex]

Therefore,

by substituting value in equation (1), we have

[tex]1 - 2 sin x cos x[/tex]

Step 3 : As, L.H.S = R.H.S

Hence Proved,

[tex](sin x - cos x)^{2} = 1 - 2 sin x cos x[/tex]

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