Question

Is square root 1 minus cosine squared theta = −sin Θ true? If so, in which quadrants does angle Θ terminate

Answer 1

√1 - cos²Ф = l sinФ l

l sinФ l = sinФ when sinФ is positive [Ф∈[0 to π]]

l sinФ l = -sinФ when sinФ is negative [Ф∈(π to 2π)]