Prove that sin(x+y) = sinx cosy + cosx siny 🔥 💁👌😍 🔥 and sin(x-y) = sinx cosy - cosx siny
Автор: Syal Mathematics
Загружено: 2023-07-21
Просмотров: 9610
Описание:
In this tutorial you will learn the proof of two very important and easy trigonometric identities"
sin(x+y) = sinx cosy + cosx siny
sin(x-y) = sinx cosy - cosx siny
These identities can be written using any two different variables as follows:
sin(a+b) = sina cosb + cosa sinyb
sin(a-b) = sina cosb - cosa sinyb
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00:00 Proof of sin(x+y) = sinx cosy + cosx siny
02:41 Proof of sin(x+y) = sinx cosy + cosx siny (Method 1)
04:50 Proof of sin(x+y) = sinx cosy + cosx siny (Method 2)
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