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ailiealien ailiealien
  • 15-05-2016
  • Mathematics
Answered

can i know the steps to these questions?

can i know the steps to these questions? class=

Verified Answer :

padawan
padawan padawan
  • 15-05-2016

  1. sin ( sin - cos ) + cos(sin + cos)
    = sin^2 - sin cos + cos sin + cos^2
    = sin^2 + cos^2 = 1

    formula: sin^2 + cos^2 = 1

    2.
    tan a tan(90-a) + sin^2 + cos^2
    = tan a tan(90-a) + 1
    = tan a / tan a + 1 = 2

    formula: sin^2 + cos^2 = 1
    tan(90-a) = 1/tan(a)
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