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4.
[tex] \sin( \alpha ) = \frac{x}{ \sqrt{ {x}^{2} + 1} }[/tex]
5.
[tex] \cos( beta) = \frac{ 2\sqrt{6} }{7} [/tex]

4]

y = x
x = 1
< = a
r = V(x^2 + y^2)
r = V(1^2 + x^2)
r = V(x^2 + 1)

sin a = y/r
sin a = x/V(x^2 + 1)


5]
sin b = 5/7
x = 5
r = 7
y = V(r^2 - x^2)
y = V(7^2 - 5^2)
y = V(49 - 25)
y = V24
y = 2V6

cos b = y/r
cos b = (2V6)/7
cos b = (2/7) V6