Trigonometry 2: Obtuse Angles

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In light of the Covid-19 pandemic, I'll be uploading O-Level Revision Packages on YouTube. This is the part 2 of the trigonometry series and it extends the trigonometric ratios to obtuse angles.

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the only video I could actually understand, much appreciated

nullhyp
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Bro thank you now I'm understanding maths🎉🎉🎉🎉

youandi
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Intro: Welcome to the Corona Virus Series
Me: Is this a troll?

yunyi
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Please tell me
Why we take same perpendicular of both triangle

DPCE-wqmn
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May I be able to access the worksheets? Thank you so much

dexterchua
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but why we use these trigonometric functions on an obtuse angle just like any other acute angle, I dont understand that :(

heferh
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Y for both cos and tan is negative for optuse and only sin is positive?

yuherng
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Mr Chen, could i ask what is the secant, cosecant and cotangent of an obtuse angle?

JAYLEE-qvhc