exam Maths Puzzle Numerical Ability

Used the symbol @ for the regular symbol.

Given that cos@ = - 4/5 and @ is in Quadrant 2, find:

sin @=
sin 2 @=
cos 3 @=
tan @ / 2=
sin (@ + 60 degrees)=

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exam Other Question

how do i solve the system by graphing.
2x + y = 4
x + y = 3 Matrix:
Show that the equation AX=B represents a linear equation of two equations in two unknowns. Solve the system and substitute into the matrix equation to check your results.