# Math

Evaluate

*Note - We have to find the exact value of these. That I know to do. For example sin5π/12 will be broken into sin (π/6) + (π/4)

So...
sin 5π/12
sin (π/6) + (π/4)
sin π/6 cos π/4 + cos π/6 sin π/4

I get all those steps. The part I am struggling with is breaking these into 2 simple ones.

a) sin 11π/12
b) cos 13π/12
c) tan (-7π/12)
d) tan (-5π/12)

1. 👍 0
2. 👎 0
3. 👁 287
1. 11 is 5 + 6

-7 is -12 + 5
-5 is -2 -3
13 is 2 + 11, and 11 is above.

Watch the algebra.

1. 👍 0
2. 👎 0
👨‍🏫
bobpursley
2. 5 and 6 over what?

They have to either be over 3, 4, 6, or 2.

1. 👍 0
2. 👎 0

## Similar Questions

1. ### muisc

In 4/4 time, what note gets the beat? A. eighth note B. quarter note C. half note D. whole note

2. ### Math. Need help

1.if g=5 and k=1, evaluate 9+gk a. 13 b. 14 c. 15 d. 16 2.Evaluate a-b^2/b if a = 10 and b = 2. a. 1 b. 3 c. 8 d. 32 3.Evaluate 3xy^2 - y if x = 2 and y = 5. a. 26 b. 30 c. 120 d. 145 4.Evaluate 2d + d^2/3 if d = 6. a. 4 b. 12 c.

3. ### Trigonometry help

If sin(x) = 1/3 and sec(y) = 13/12 , where x and y lie between 0 and π/2, evaluate the expression using trigonometric identities. (Enter an exact answer.) sin(x + y)

4. ### Music

1. How many beats are in one measure of 6/4? A) 2 B) 4 C) 6*** D) 9 2. Which rhythmic value gets the beat in 4/8? A) eighth note*** B) quarter note C) half note D) whole note Am I correct?

1. ### Pre-Calculus

The exponential function y(x)=Ce^ax satisfies the conditions y(0)=6 and y(1)=7. (a) Find the constants C and a. Enter the exact value of a. (b) Find y(2). Enter the exact answer. Simplify the answer so it does not contain any

2. ### pre cal

Find the exact values for the lengths of the labeled segments a, b and p drawn in green, red, and blue, respectively. Note that r=9 is the radius of the circle, and s=8 is the arc length from the point (9,0) around the circle to

3. ### Pre-Cal

Use an Addition or Subtraction Formula to write the expression as a trigonometric function of one number. (tan(74°)-tan(14°))/(1+tan(74°)tan(14°)) =__________ Find it's exact value (not decimal form) =__________ Note: A

4. ### Math

If sin(x) = 1/3 and sec(y) = 29/21 , where x and y lie between 0 and π/2, evaluate the expression using trigonometric identities. (Enter an exact answer.) cos(2y)

1. ### Math - Radian Measure

An engine on a jet aircraft turns at about 12 000 rpm. Find an exact value, as well as an approximate value, for the angular velocity of the engine in radians per second. I don't understand how to find the exact value

2. ### music

What does a dot (•) do to the value of a note or rest? A. It shifts the weight to a normally unaccented note. B. It adds half the value of the note or rest to the note or rest. C. It adds twice the value of the note or rest to