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SAT test tip 2

Sine and Cosine of complementary angles (cofunction) sine( x ) = cos (90-x) sine (2) = 0.034899496 this is the same answer you should get if we try to find cos (90-2) or cos (88)

lets check on the calculator cos 88 = same . it should be 0.034899496 sin (42) = cos (90-42) = cos (48) this means that since sin (42) = 0.6691 then cos (48) =0.6691 Examples: sin (2) = 0.0349 cos (88)=0.0349 Sin (50) = 0.7660 Cos (40) = 0.7660 If sin (x) =.8978 then cos (90-x) = 0.8978 If sin (2x) = 0.226789 then cos (90 -2x ) =0.226789 Try this: if sin 3x = 0.5467 then cos _________ = 0.5467 answer:

cos (90 - 3x) = 0.5467

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