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image url="https://negativespace.co/1062"Math and Arithmetic
+2
What is the exact solution to cosx equals sin2x?
Asked by Anonymous
CosX = Sin2x Using Trog. Identityt CosX = 2SinXCosX CosX cancels down to '1' Hence CosX/CosX = 2 SinX 1 = 2SinX SinX = 1/2 = 0.5 SinX = 0.5 X = Sin^(-1) 0,5 X =
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Math and Arithmetic
+2
When does cos x equal -sin x?
Asked by Anonymous
Cos (x) = -Sin(x)
1 = -Sin(x) / Cos (x)
1 = -Tan(x)
Tan(x) = -1
x = Tan^-1(-1(
x = -45 degrees = - pi /4 , 3pi/4, 5pi/4 ....
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