book Maths Puzzle Numerical Ability

find logcos(pi/5)

thanks so much if you can help me

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book Other Question
the height h, of a ball above ground t seconds after it is thrown vertically upwards can be approximated by the formula h=vt-5t squared, where v is the intial speed with which the {x|-2 < x < 9}




{ x | - 2 < x < 8 }