Prove that ${{\\sin }^{2}}\\dfrac{\\pi }{6}+{{\\cos }^{2}}\\dfrac{\\pi }{3}-{{\\tan }^{2}}\\dfrac{\\pi }{4}=-\\dfrac{1}{2}$
![Appendix B. Raspberry Pi 2 HDMI modes - Programming for the Internet of Things: Using Windows 10 IoT Core and Azure IoT Suite [Book] Appendix B. Raspberry Pi 2 HDMI modes - Programming for the Internet of Things: Using Windows 10 IoT Core and Azure IoT Suite [Book]](https://www.oreilly.com/api/v2/epubs/9781509302154/files/graphics/btab01.jpg)
Appendix B. Raspberry Pi 2 HDMI modes - Programming for the Internet of Things: Using Windows 10 IoT Core and Azure IoT Suite [Book]
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