![\text{Factor:}\qquad \qquad 1+2\sin \bigg(\dfrac{A+B}{4}\bigg)\bigg[\cos \bigg(\dfrac{A-B}{4}\bigg)-\sin \bigg(\dfrac{A+B}{4}\bigg)\bigg]](/tpl/images/0774/0532/f28be.png)
![\text{Cofunction:}\qquad 1+2\sin \bigg(\dfrac{A+B}{4}\bigg)\bigg[\cos \bigg(\dfrac{A-B}{4}\bigg)-\cos \bigg(\dfrac{\pi}{2}-\dfrac{A+B}{4}\bigg)\bigg]\\\\\\.\qquad \qquad \qquad =1+2\sin \bigg(\dfrac{A+B}{4}\bigg)\bigg[\cos \bigg(\dfrac{A-B}{4}\bigg)-\sin \bigg(\dfrac{2\pi -(A+B)}{4}\bigg)\bigg]](/tpl/images/0774/0532/4dc0b.png)
![\text{Sum to Product:}\quad 1+2\sin \bigg(\dfrac{A+B}{4}\bigg)\bigg[2 \sin \bigg(\dfrac{2\pi-2B}{2\cdot 4}\bigg)\cdot \sin \bigg(\dfrac{2A-2\pi}{2\cdot 4}\bigg)\bigg]\\\\\\.\qquad \qquad \qquad =1+4\sin \bigg(\dfrac{A+B}{4}\bigg)\cdot \sin \bigg(\dfrac{\pi-B}{4}\bigg)\cdot \sin \bigg(\dfrac{\pi -A}{4}\bigg)](/tpl/images/0774/0532/998c2.png)
If A, B ,C are the angles of a triangle then,
Please help me to prove this!
...
Mathematics, 21.09.2020 01:01, dulaneystrode
If A, B ,C are the angles of a triangle then,
Please help me to prove this!
Answers: 2
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