exam Maths Puzzle Numerical Ability

Using verifications solve:
theta=@

Sin@-cos@+1/Sin@+cos@-1= sin@+1/cos@

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exam Other Question

4/(x+4)
+2/(x-5)
=32/(x^2-25)

Solve solve each system by the substition method. Indicate whether each system is independent, inconsistent or dependent.
problem # 14
x= 1/8y - 1
y= 1/4x + 39

problem #20
x + 3(x