Evaluate the six trig functions by when given one value and constraint

👉 Learn how to evaluate the six trigonometric functions given some constraints. When given the value of one trigonometric function, we can use a right triangle with one of its legs on the x-axis and the other leg, perpendicular to the x-axis is drawn such that the reference angle is at the origin. The x-coordinate of the given point represents the adjacent of the reference angle while the y-coordinate represent the opposite of the reference angle. The hypothenuse is the line joining from the origin to the terminal side of the 'opposite' line.

Using the Pythagoras theorem, we can obtain any of the unknown sides of the right triangle. Having the opposite, the adjacent and the hypothenuse of the reference angle of the right triangle, we can then evaluate the other trigonometric functions accordingly within the given constraint.

Organized Videos:
✅ Evaluate the Trigonometric Functions With Triangles
✅ Evaluate Trig Functions Using Special Right Triangles
✅ Evaluate the Six Trig Functions Given Right Triangle
✅ Evaluate the Six Trig Functions Given Equations
✅ Evaluate Trig Functions from a point | Learn About
✅ Evaluate the six Trig Functions given a point
✅ Determine the Quadrant Given Constraints
✅ Evaluate the trigonometric function with constraint

Connect with me:

#trigonometry #brianmclogan

[kitchensink]

Seven years later and his video's are still getting at least somebody through Pre-Calc. Thank you.

[Joesolo]

Very helpful, but I had to say, that was a very effective "stop talking" face at 0:36

[jaimiedeguzman]

my teacher describes it in such a confusing way, I didn’t know it was that simple to understand thank you sm

[NGC-cznr]

best video ever, literally saved my score and helped me to understand something that's taken me retaking the class twice in order to understand.

[ahmadsoughar]

hahah! i was so confused and freaked out when he said Ahmad... i thought he was talking to me! haha Ahmad stop talking and focus, you letting me down hahah

[AzeleaAsh]

Thank you! You explained better than my teacher lol

[thatskapKelly]

Why was there a 5 placed? I get the triangle is a perfect square but... what does that have to do with the 5?

[PiNkBuBbLeGuM]

If you didn't post these videos, I'd fail my college class. Thank you!

[iwnlelusion]

Hi! My question is why how did you find 5 ? or how is it 5?

[cutieboo]

My favorite teacher! You are so helpful! 谢谢 ^0^

[wingedfeline]

This made it way easier to understand for me! Thanks

[soupypunk-pkys]

I have my precal final tomorrow. Just brushing up on things before I tackle that 😅

[fun]

if x is -4 then we cannot have triangle in the 4th quadrant. It should be either in 2nd or 3rd quadrant

[Matthew-dhci]

1:26 justin got that "pay attention" callout

[leticiasegoviano]

Thank you MUCH! you saved my homework today!

[nathan_kul]

Thankyou so much I am liking every video now on

[tamerabarnett]

Would this method work the same for cos 21/29 with the same constraints?

[dantea]

Awesome Video! Wish my teacher was as good.

[layals]

how can you tell in which quadrant sine is less than 0? confused about the constraints :(

[babarmurtaza]

What's going to be the reference angle for -9/2pi?