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# General right angle trig: if cos(theta) = 2/5, find the value of tan(theta) i did pythagoren theroy a^2 + b^2 = c^2 2^2 + b^2 = 5^2 4 + b^2 = 25 b^2 = square root of 21 how do you simplify the square root of 21

## Question

###### General right angle trig: if cos(theta) = 2/5, find the value of tan(theta) i did pythagoren theroy a^2 + b^2 = c^2 2^2 + b^2 = 5^2 4 + b^2 = 25 b^2 = square root of 21 how do you simplify the square root of 21
general right angle trig: if cos(theta) = 2/5, find the value of tan(theta)
i did pythagoren theroy
a^2 + b^2 = c^2
2^2 + b^2 = 5^2
4 + b^2 = 25
b^2 = square root of 21
how do you simplify the square root of 21? like what is it simplified?

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