tan θ = sin θ/cos θ
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tan (theta x theta) : must square the value of the angle, theta, before applying the trig function, tangent.
Yes. (Theta in radians, and then approximately, not exactly.)
It also equals 13 12.
tan(theta) = 1 then theta = tan-1(1) + n*pi where n is an integer = pi/4 + n*pi or pi*(1/4 + n) Within the given range, this gives theta = pi/4 and 5*pi/4
cot theta=tan(90-tetha)