Why is cos(180 - theta) = -cos(theta) and sin(180 - theta) = sin(theta)?

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It's all about Transforming the theta at the first quadrant to the corresponding theta in question! Then, observing what happens to the sines and cosines - means finding out their parallel entities. And the direction they point towards determines whether their signs should be positive or negative.

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Комментарии
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Now I get it I was so confused with the all silver tea cup

karupsvivek
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It helped me a lot..Thank you sir.... 💕 Love your vedios...

LONE-MUHAIB
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awsome work sir... it helped me alot....this is what it means action speak more then word. please include universal standers scientific names as well

siddharth
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Hi video creator 🙏,
There is no right angle tringle at 120° so no perpendicular and no hypotenuse for 120° . And wthat you show in the video is( - angle ) negetive angle . This is not the visual proof of what you want to show (ie. the Equation).

setusof