Use trigonometric substitution to write the algebraic expression as a trigonometric function of θ.?
Use trigonometric substitution to write the algebraic expression as a trigonometric function of θ, where 0<θ<π/2 (quadrant I).
√(9-x²), x = 3cosθ
Update:I got 3sinx, I'm asking on here to verify my answers.
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yes thats right
It relies upon on which trig id you want to apply. i might want to for my section %. to divide via cosx because then you definitely have sinx/cosx=a million OR tanx=a million and it is common to get your values from there. in case you had chosen to divide via sinx you've had cotx=a million and that is positive too.