Learn how to evaluate for sine using coterminal and reference angles

👉 Learn how to evaluate trigonometric functions of a given angle. Given an angle greater than 2pi in radians, to evaluate the trigonometric functions of the given angle, we first determine the smallest positive coterminal angle of the given angle. This we can do by subtracting 2pi or a multiple of 2pi from the given angle.

Coterminal angles are angles with the same terminal side. After obtaining the coterminal angle, we plot the angle on the x-y-coordinate plane and with the help of the Pythagoras theorem or the special angles, we can evaluate the trigonometric functions of the given angle.

Timestamps:
0:00 Intro
1:05 Start of Problem

Corrections:
6:00 Forgot to add the sign of the quadrant. Since its in the fourth quadrant, sine should be negative since the y-values in the fourth quadrant are negative.

Organized Videos:
✅ Trigonometric Functions and The Unit Circle
✅ The Unit Circle | Learn About
✅ Points of the Unit Circle | Learn About
✅ Angles of the Unit Circle | Learn About
✅ Trigonometric Functions of the Unit Circle
✅ Find the Point on the Unit Circle
✅ Evaluate Trigonometric Functions Using the Unit Circle
✅ Evaluate the Six Trigonometric Functions Given and Angle
✅ Evaluate trigonometric functions using a calculator
✅ Evaluate trigonometric functions using identities

Connect with me:

#trig #unitcircle #brianmclogan

[KushBae]

since its in the fourth quadrant, sine should be negative since the y-values in the fourth quadrant are negattive.

[shivpatel]

Brandon pls don’t take this man for granted....there’s a reason why the rest of us find ourselves here.

[Nbodysfaultbutmine]

I'm not even an english speaker and it was so clear and so helpful. Thank you so much!

[alexcogames]

thank you a lot, tomorrow i have a math test and this helped me a lot! i finally understand this magic circle! thank you

[crow]

Man Brandon got the roast hahaha, great video

[robot_asahi]

the students of brian doesn't deserve him

[djklsjfjflkdsjfsd]

I wonder if Brandon knows how famous he's become from all these videos. lol

[MatteoILcattivo]

So what if the denominator was 7 or 5. For example 9pi/7 ? Something that is not on the unit circle?

[mayalong]

This is great! What grade is this for? Is this for Alg2 or Precal?

[jeremygraham]

Just curious Since it was the 4th quadrent wasnt that supposed to be negative [ 3^1/2]/2. Becuase the adjecent side 3^1/2 should have been negative because its going down in the Y axis or am i wrong

[study.with.Sangram.]

Hay you have great teaching system 🇮🇳🇮🇳

[muhammedsillah]

All the math teachers at my school have a phone pouch with numbered units to insert your phone the moment you walk into class. I hate it since I've to do it but its effective so you might wanna look into it.

[bernicelin]

Thank you your glass should be so great full for your teaching

[himanshudixit]

Could hv simply done 12pi/3 - pi/3=sin60

[davidchavez]

Why not just demonstrate that π/3 is 1/6th of 2π and that 1/6th of 360° is 60°?

[freitas]

Bro u have one think wrong in your video... 2pi =6pi/3=12/6 not 12/3 0.0

[peytoncooley]

Found this video it couldn't help me (no offence) as my teacher was explaing how to understand my study guide. Next day went in for a test clueless and made an 82.

[bananaforscale]

sin (3pi/10) - sin (pi/10) = ?
and why it is 1/2

[bernicelin]

Shit I think I’m going to fail without your healp

[bernicelin]

I just did this stuff in class and didn’t understand anthing