Question

write the expression cos(∅-$\frac{3\pi }{2}$) as a single function of∅ .

Answer 1

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Answer 2

Secant, cosecant and cotangent, almost always written as sec, cosec and cot are trigonometric functions like sin, cos and tan. Note, sec x is not the same as cos-1x (sometimes written as arccos x). Remember, you cannot divide by zero and so these definitions are only valid when the denominators are not zero