sin(pi/4) and cos(pi/4) are both the same. They both equal (√2)/2≈0.7071■
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Sin(3pi/2) = Sin(2pi - pi/2) Double angle Trig. Identity. Hence Sin(2pi)Cos(pi/2) - Cos(2pi) Sin(pi/2) Sin(2pi) = 0 Cos(pi/2) = 0 Cos(2pi) = 1 Sin(pi/2) = 1 Substituting 0 x 0 - 1 x 1 = 0 - 1 = -1 The answer!!!!!
sin(3π/2) = -1
tangent of pi/4 = 1
1/ Tan = 1/ (Sin/Cos) = Cos/Sin = Cot (Cotangent)
You can calculate that on any scientific calculator. Presumably, for any expression that involves "pi" the angle should be in radians, so be sure to set the calculator to radians first.