![trigonometry - Inverse trigonometric functions without calculator, arcsin, arctan - Mathematics Stack Exchange trigonometry - Inverse trigonometric functions without calculator, arcsin, arctan - Mathematics Stack Exchange](https://i.stack.imgur.com/n33pi.png)
trigonometry - Inverse trigonometric functions without calculator, arcsin, arctan - Mathematics Stack Exchange
![IMPORTANT Prove Sum of Tan Inverse of 1 2 and 3 is 180 arctan(1) + arctan(2) + arctan(3) = 180 - YouTube IMPORTANT Prove Sum of Tan Inverse of 1 2 and 3 is 180 arctan(1) + arctan(2) + arctan(3) = 180 - YouTube](https://i.ytimg.com/vi/ncJK77mReT4/maxresdefault.jpg)
IMPORTANT Prove Sum of Tan Inverse of 1 2 and 3 is 180 arctan(1) + arctan(2) + arctan(3) = 180 - YouTube
![Find the exact value of the expression. (Hint: Sketch a right triangle.) sin (arctan 3 / 4) | Homework.Study.com Find the exact value of the expression. (Hint: Sketch a right triangle.) sin (arctan 3 / 4) | Homework.Study.com](https://homework.study.com/cimages/multimages/16/jiot5n5926552293891405886.png)
Find the exact value of the expression. (Hint: Sketch a right triangle.) sin (arctan 3 / 4) | Homework.Study.com
![Find the exact value of the expression. Use a graphing utility to verify your result. sin(arctan 4/3). | Homework.Study.com Find the exact value of the expression. Use a graphing utility to verify your result. sin(arctan 4/3). | Homework.Study.com](https://homework.study.com/cimages/multimages/16/triangle1310709565969981489.png)
Find the exact value of the expression. Use a graphing utility to verify your result. sin(arctan 4/3). | Homework.Study.com
![SOLVED:Evaluate each expression without using a calculator. (Hint: See Example 3.) (a) sec[arctan(-(3)/(5))] (b) tan[arcsin(-(5)/(6))] SOLVED:Evaluate each expression without using a calculator. (Hint: See Example 3.) (a) sec[arctan(-(3)/(5))] (b) tan[arcsin(-(5)/(6))]](https://cdn.numerade.com/previews/0db63726-5b59-4736-a16e-a85914c0ee81_large.jpg)
SOLVED:Evaluate each expression without using a calculator. (Hint: See Example 3.) (a) sec[arctan(-(3)/(5))] (b) tan[arcsin(-(5)/(6))]
![Dave Richeson on Twitter: "Euler proved that π/4=arctan(1/2)+arctan(1/3), which can be used for computing digits of π (using the arctangent series). I wondered if I could prove it without using a trig Dave Richeson on Twitter: "Euler proved that π/4=arctan(1/2)+arctan(1/3), which can be used for computing digits of π (using the arctangent series). I wondered if I could prove it without using a trig](https://pbs.twimg.com/media/DhXRIQiX0AA9cMz.jpg:large)