exam Maths Puzzle Numerical Ability

please Indicate whether the problem is true or false but show all work thanks
sin 0(with a dash through it) = cos (90-0(with a dash through it))

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exam Other Question

3/2L=-4m what is L In one year, Cholena Youngblood earned the same amount of interest from an investment at 8%annual interest as an investment at 12% percent annual interest.She had invested $1500 more at 8%.How much money did she invest at 12%.