Step-by-step explanation:
[tex] \cos( \frac{ - 4}{7} ) [/tex]
which means base = -4 ,perpendicular = ? ,hypotenuse = 7
let base = x perpendicular = y and hypotenuse = r
according to Pythagoras theorm
r²=x²+y²
y²= x² - r²
=( -4)²-(7)²
= 33
square root both sides
y = √33
value of sin and tan
[tex] \sin( \frac{ \sqrt{33} }{7} ) [/tex]
[tex] \tan( \frac{ - 4}{ \sqrt{33 } } ) [/tex]
