Sunday

August 31, 2014

August 31, 2014

Posted by **Anonymous** on Friday, August 3, 2007 at 11:59am.

x= t^2 + 3

y = 2t

Without a calculator (how can I do that?), determine the exact value of each expression.

cos(Sin^-1 1/2)

Sin^-1 (sin 7pi/6)

x= t^2 + 3

y = 2t

Eliminate t using the last equation:

t = y/2

insert this in the first equation.

-----------------------------------

arcsin(1/2) = pi/6

cos[arcsin(1/2)] = cos(pi/6) =

1/2 sqrt[3]

Note that the arcsin function is defined as the inverse of the sin function in the interval from minus pi/2 to pi/2.

This means that arcsin(sin(x)) = x

if x is between -pi/2 and pi/2

If x is not in this interval you can use:

sin(x) = sin(x + 2 pi n)

and

sin(x) = sin(pi-x)

E.g. sin(7pi/6) = sin(pi - 7/6 pi) =

sin(-pi/6) therefore:

sin(sin(7pi/6)) = -pi/6

sin(7pi/6) = sin()

Correction:

E.g. sin(7pi/6) = sin(pi - 7/6 pi) =

sin(-pi/6) therefore:

arcsin[sin(7pi/6)] = -pi/6

**Related Questions**

Calc AB - eliminate the parameter and write a rectangular equation for x=(t^2)+3...

Math - Eliminate the parameter and write the corresponding rectangular equation ...

Math - Eliminate the parameter and write the corresponding rectangular equation ...

Math - Eliminate the parameter and write the corresponding rectangular equation ...

precalc - Eliminate the parameter and write the corresponding rectangular ...

calculus - Eliminate the parameter and write the corresponding rectangular ...

Math - Eliminate the parameter and write the corresponding rectangular equation ...

Calculus.. - 5. Eliminate the parameter and write the corresponding rectangular ...

precalc - a circle is formed with a center (-3,5) and a radius.of 4 write the ...

Math - Eliminate the parameter in the pair of parametric equations to find the ...