How Does the Jacobian Process Work in Kinematics?

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The Jacobian process in kinematics involves calculating the derivatives of position vectors with respect to joint variables, such as angles. In this case, differentiating the middle column with respect to theta_3 requires applying the chain rule and understanding the relationships between the joint angles and the position coordinates. The transition from r_2cos(theta_2) to -cos(theta_3) indicates a change in the reference frame or orientation due to the influence of theta_3. This process is crucial for analyzing robotic motion and ensuring accurate control of joint movements. Understanding these derivatives is essential for solving problems related to robotic kinematics.
clurt
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Hey guys,

Im studying for an exam and don't fully understand the jacobian process. Speciffically how you can differential the middle colum with respect to theta_3. Please view attached. So from step 1 to 2. Thanks.
 

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So r_2cos(theta_2) goes to -cos(theta_3)

How?
 
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