hassanessam557
hassanessam557 hassanessam557
  • 24-10-2020
  • Mathematics
contestada

cos² y– sin²y=1–2sin² y

simplify pls, urgent​

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devishri1977
devishri1977 devishri1977
  • 24-10-2020

Answer:

Step-by-step explanation:

Cos²y + Sin² y = 1

Therefore,   Cos² y = 1 - Sin² y

LHS = Cos² y - Sin² y

       = 1 - Sin² y - Sin² y    {Combine like terms}

       = 1 - 2sin² y  = RHS

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Mashfia
Mashfia Mashfia
  • 24-10-2020

    cos²y - sin²y = 1 - 2sin²y

or, cos²y - sin²y + 2sin²y = 1

or, cos²y + sin²y = 1 [It's a formula]

(Is that what you mean by simplify?)

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