**Problem : **
Why do the following pairs of functions always have the same sign: sine
and cosecant, cosine and secant, tangent and cotangent?

**Problem : **
In which quadrant do the most trigonometric
functions have negative signs?

**Problem : **
Which value in the following group is not equal to the others:
sin(),
cos(*Π*), cot(), sec(0)?

**Problem : **
Which value in the following group has a different sign from the others:
sin(), sec(),
cot(), cos()?

**Problem : **
When *θ* = *Π*, which two trigonometric functions are undefined?

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