ailiealien
ailiealien
15-05-2016
Mathematics
contestada
can i know the steps to these questions?
Respuesta :
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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