Cos25=cos_rad(((5*pi)/36)) is your answer.
To change the negative to a positive, just put the same number as into a fraction under 1 but without the negative sign:
11^-4 would become 1 / 11^4
Answer:
Rational numbers are those numbers that are integers and can be expressed in the form of x/y where both numerator and denominator are integers whereas irrational numbers are those numbers which cannot be expressed in a fraction. ... The denominator of a rational number is a natural number(a non-zero number).
Distance between points
D=

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points are (5, 4) and (−3, −1)
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D=√(-1-4)^2+(-3-5)^2
D=√25+64
D=√89
D=9.433 units