Posted by **chyrl** on Saturday, December 9, 2006 at 4:15pm.

Can anyone help w/ these.

1) Solve the equation in the internal [0deg, 360deg].

a) sin 2x = -sin x

b) sin 2T = -1/2 (where T is angle)

c) 4 sin^2T = 3

2) Evaluate the expression.

sin(arctan 2)

3) Rewrite the following w/o using trigonometric or inverse tirgonometric functions.

cos(arcsin u)

In a use the double angle formula: Sin2X= 2sinXcosX

When you divide thru by sinX, be certain to remember to test to see if X=0 is a solution also.

In b, solve for 2T (then divide it by two).

in C, take the square root of each side, solve for sinT, and then T.

in 2, remember solve for arcTan2, then what is the sine of that?

In 3, remember that if sine = u, then cos of the complementary angle is u.

## Answer This Question

## Related Questions

- math - Eliminate the parameter (What does that mean?) and write a rectangular ...
- tigonometry - expres the following as sums and differences of sines or cosines ...
- TRIG! - Posted by hayden on Monday, February 23, 2009 at 4:05pm. sin^6 x + cos^6...
- Calculus - Consider the function f(x)=sin(1/x) Find a sequence of x-values that ...
- algebra - Can someone please help me do this problem? That would be great! ...
- Calculus - Consider the function f(x)=sin(1/x) Find a sequence of x-values that ...
- Calculus - Consider the function f(x)=sin(1/x) Find a sequence of x-values that ...
- Mathematics - Trigonometric Identities - Let y represent theta Prove: 1 + 1/tan^...
- trig - Reduce the following to the sine or cosine of one angle: (i) sin145*cos75...
- Math - Calculus - The identity below is significant because it relates 3 ...

More Related Questions