Sal differentiates sec(3¹/2-x) and evaluates the derivative at x=¹/4. Practice this lesson yourself on KhanAcademy.org right now: https://www.khanacademy.org/math/ap-calculus-ab/ab-derivative-rules/ab-diff-trig-func/e/differentiate-trigonometric-functions?utm_source=YT&utm_medium=Desc&utm_campaign=APCalculusAB Watch the next lesson: https://www.khanacademy.org/math/ap-calculus-ab/ab-derivative-rules/ab-diff-strategy/v/correcting-work-on-derivative-strategies?utm_source=YT&utm_medium=Desc&utm_campaign=APCalculusAB Missed the previous lesson? https://www.khanacademy.org/math/ap-calculus-ab/ab-derivative-rules/ab-diff-trig-func/v/derivatives-of-secx-and-cscx?utm_source=YT&utm_medium=Desc&utm_campaign=APCalculusAB ?utm_source=YT&utm_medium=Desc&utm_campaign=APCalculusAB AP Calculus AB on Khan Academy: Bill Scott uses Khan Academy to teach AP Calculus at Phillips Academy in Andover, Massachusetts, and heÕs part of the teaching team that helped develop Khan AcademyÕs AP lessons. Phillips Academy was one of the first schools to teach AP nearly 60 years ago. ... https://www.youtube.com/watch?v=6QRtLh_THmo Note: All Khan Academy content is available for free at (www.khanacademy.org)

Learn how to solve word problems by adding the same number many times. Practice this lesson yourself on KhanAcademy.org right now: https://www.khanacademy.org/math/early-math/cc-early-math-add-sub-100/cc-early-math-skip-counting/e/repeated-addition?utm_source=YT&utm_medium=Desc&utm_campaign=EarlyMath Watch the next lesson: https://www.khanacademy.org/math/early-math/cc-early-math-measure-data-topic/cc-early-math-length-intro/v/order-by-length?utm_source=YT&utm_medium=Desc&utm_campaign=EarlyMath Missed the previous lesson? https://www.khanacademy.org/math/early-math/cc-early-math-add-sub-100/cc-early-math-skip-counting/v/skip-counting-by-100-example?utm_source=YT&utm_medium=Desc&utm_campaign=EarlyMath Early Math on Khan Academy: Math begins with counting. It's the most important skill we learn in our early years and becomes the foundation for all other math concepts. Once we can count, we can add, subtract, and measure the world around us. Shortly thereafter, we can learn about place values, plots, graphs, time, money, and shapes. These early math skills are presented in this subject's tutorials in a straightforward, understandable, and (dare we say it) fun way! ... https://www.youtube.com/watch?v=j5c6pqAP2IA Note: All Khan Academy content is available for free at (www.khanacademy.org)

Hypothesis Test Comparing Population Proportions Watch the next lesson: https://www.khanacademy.org/math/probability/statistics-inferential/chi-square/v/chi-square-distribution-introduction?utm_source=YT&utm_medium=Desc&utm_campaign=ProbabilityandStatistics Missed the previous lesson? https://www.khanacademy.org/math/probability/statistics-inferential/hypothesis-testing-two-samples/v/comparing-population-proportions-2?utm_source=YT&utm_medium=Desc&utm_campaign=ProbabilityandStatistics Probability and statistics on Khan Academy: We dare you to go through a day in which you never consider or use probability. Did you check the weather forecast? Busted! Did you decide to go through the drive through lane vs walk in? Busted again! We are constantly creating hypotheses, making predictions, testing, and analyzing. Our lives are full of probabilities! Statistics is related to probability because much of the data we use when determining probable outcomes comes from our understanding of statistics. In these tutorials, we will cover a range of topics, some which include: independent events, dependent probability, combinatorics, hypothesis testing, descriptive statistics, random variables, probability distributions, regression, and inferential statistics. So buckle up and hop on for a wild ride. We bet you're going to be challenged AND love it! About Khan Academy: Khan Academy offers practice exercises, instructional videos, and a personalized learning dashboard that empower learners to study at their own pace in and outside of the classroom. We tackle math, science, computer programming, history, art history, economics, and more. Our math missions guide learners from kindergarten to calculus using state-of-the-art, adaptive technology that identifies strengths and learning gaps. We've also partnered with institutions like NASA, The Museum of Modern Art, The California Academy of Sciences, and MIT to offer specialized content. ... https://www.youtube.com/watch?v=dvSa_tx04hw Note: All Khan Academy content is available for free at (www.khanacademy.org)

Genetic and environmental influences on mouse activity cycles. ... https://www.youtube.com/watch?v=Tbpj-dNGrhc Note: All Khan Academy content is available for free at (www.khanacademy.org)