exam Maths Puzzle Numerical Ability

I am a grade 10 students and i like trigonometry but i found this quiet tough.Plz can u solve it for me..
prove that (sec4a-1)/(sec8a-1)=tan4a/tan2a

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exam Other Question

I am not sure of these categories because I am new to college algebra. the question is Find the area of a fenced yard with a lenght of 18 yards and a width of 10 yards. How do you state the slope and the y-intercept form for this problem

2x+5y+10