exam Maths Puzzle Numerical Ability

Find exact value of each of the following:

1. cos theta =40/41, theta lies in quadrant IV

Find sin 2 theta, cos 2 theta and tan 2 theta

2. tan alpha = 8/15, alpha lies

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exam Other Question

Hello,
Please help!

Solve the system of equation by elimination.

6x + 5y = -20
-6x - 10y = 25

Thanks Write an equation of the line containing the given point and parallel to the given line. Express your answer in the form of y=mx+b.

(5,6);x+8y=5

The equation of the line is y= _____