exam Maths Puzzle Numerical Ability

Which one of the following statements is true for trigonometric functions of two acute angles A and B in a right triangle?
A cosB=tanA
b. cotB=cosA
c. sinB=sinA
d. tanB=cotA

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exam Other Question

find the slope of the passing through the following points:
(2, 0) and (0, -4)

A. 2
B. -2
C. 1/2
D. -1/2

Thank you for any help... Help??? If a graph shows that f(x)=x^3 and g(x)=ax^3. What can be concluded about the value of a?

a. a<-1
b. -1<a<0
c. 0<a<1
d. 1<a