$$1+\cos \,{{56}^{o}}+\cos \,{{58}^{o}}-\cos {{66}^{o}}=$$ [IIT 1964]

Question

TuteeHUB · Accepted Answer

$$2\,\cos {{28}^{o}}\,\cos \,{{29}^{o}}\,\sin \,{{33}^{o}}$$

TuteeHUB · Answer

$$2\,\cos {{28}^{o}}\,\cos \,{{29}^{o}}\,\cos \,{{33}^{o}}$$

TuteeHUB · Answer

$$4\,\cos {{28}^{o}}\,\cos \,{{29}^{o}}\,\cos \,{{33}^{o}}$$

TuteeHUB · Answer

$$4\,\cos {{28}^{o}}\,\cos \,{{29}^{o}}\,\sin {{33}^{o}}$$

\[1+\cos \,{{56}^{o}}+\cos \,{{58}^{o}}-\cos {{66}^{o}}=\] [IIT 1964]