Cos(360 - X) =
Trig. Identity
Cos(360)Cos(x) + Sin(360)Sin(x) =>
1CosX + 0Sinx =>
CosX + o =>
CosX
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Tan^2
You can use the Pythagorean identity to solve this:(sin theta) squared + (cos theta) squared = 1.
sin/cos
It depends if 1 plus tan theta is divided or multiplied by 1 minus tan theta.
4Sin(x)Cos(x) = 2(2Sin(x)Cos(x)) = 2Sin(2x) ( A Trig. identity.