**How do you solve cos 100 without a calculator?**

The answer is -pi/4 Alright, archtan / tan^-1(x) is the inverse of tangent. Tan is sin/cos. Like the inverse of sin, the inverse of tan is also restricted to quadrants 1 and 4. Knowing this we are solving for the inverse of tan -1. We are basically being asked the question what angle/radian does tan(-1) equal. Using the unit circle we can see... 2/09/1996 · Date: 9/2/96 at 12:14:5 From: Doctor Ken Subject: Re: Sine and Cosine Without a Calculator Hello! The easiest way to find Sines and Cosines is to use the picture method. . To draw one of these yourself, you would first make a unit circle, which is a circle of radius 1 with its center at (0,0).

**How do you solve sin (5pi/3) without a calculator**

28/02/2013 · Deriving a chart for trig functions is simple for angles 0°, 30°, 45°, 60°, and 90°. Sine of these angles is a series of the square root 0 through 4, divided by 2. Cosine is just the reverse... Demonstrates how to use trig ratios to do simple solving of triangles. Search . r/60 = tan(30°) r = 60tan(30 Note: Since the sine and cosine ratios involve dividing a leg (one of the shorter two sides) by the hypotenuse,

**How can I solve sin210 degree without using a calculator**

How To: Calculate math without a calculator By 5min; 3/29/11 11:49 AM. WonderHowTo. Before the calculator and even the abacus was invented, there was a little instrument called the human brain that we used to do math. Remember that? While most of us turn to our trusty Ti-84s to do calculus homework or whip out our cell phone calculators to determine how much we should tip at Johnny Rocket's... 8/05/2008 · Please provide steps and examples. Thanks Yahoo Singapore Answers Sign in Mail ? Help

**What is sin 2pi/3? How do you solve without a calculator**

To solve the expression sin 2pi/3, we can convert first 2pi/3 into degrees. pi is equal to 180, hence 2pi/3 is equal to 120 degrees. 120 degrees is located in the second quadrant in which the terminal angle equivalent is 60 degrees. Using special triangle 30-60-90, sin 120 is equal to sqrt 3 over 2.... 360 - 330 = 30, so we are subtracting 30 degrees from 360 to get the sin inverse, 330. Since we are subtracting from 360, the ratio will remain sin, and because it is in the 4th quadrant, the sin …

## How To Solve Sin 30 Without A Calculator

### What is sin 2pi/3? How do you solve without a calculator

- Without a calculator evaluate cos(9pi/4)?? im usually so
- Solving Trigonometric Equations · Precalculus
- How do I find the value of sin 330? Socratic
- How do I find the value of sin 330? Socratic

## How To Solve Sin 30 Without A Calculator

### 28/02/2013 · Deriving a chart for trig functions is simple for angles 0°, 30°, 45°, 60°, and 90°. Sine of these angles is a series of the square root 0 through 4, divided by 2. Cosine is just the reverse

- If you look really closely, you’ll notice that 45 degrees – 30 degrees = 15 degrees, and 45 degrees + 30 degrees = 75 degrees. For the angles you can rewrite as the sum or difference of special angles, here are the sum and difference formulas for sine:
- To solve the expression sin 2pi/3, we can convert first 2pi/3 into degrees. pi is equal to 180, hence 2pi/3 is equal to 120 degrees. 120 degrees is located in the second quadrant in which the terminal angle equivalent is 60 degrees. Using special triangle 30-60-90, sin 120 is equal to sqrt 3 over 2.
- Then you can solve for sin 15 with the difference formula, writing sin 15 = sin (45 - 30). Using the formula sin45 x cos 30 - cos45 x sin 30, you will come up with sq root (6) / 4 - sq root (2) / 4, which can be written as 1/4 x sq root 2 x (sq root 3 - 1), the Professor's end answer for sine 15.
- To solve the expression sin 2pi/3, we can convert first 2pi/3 into degrees. pi is equal to 180, hence 2pi/3 is equal to 120 degrees. 120 degrees is located in the second quadrant in which the terminal angle equivalent is 60 degrees. Using special triangle 30-60-90, sin 120 is equal to sqrt 3 over 2.

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