- Simplify cos(25) cos(50) +sin(25) sin(50) there answer is cos25 but how do you get there?

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If sin A+ cos A=root 2, calculate tan A+cot A? A coordinate system is defined with orthogonal x-,y-, and z-axes.How many of the d orbitals have lobes pointing along one or more ofthe axes? How to find valency of a transitive element using spdf method. Please explain with examples.? Write a balanced equation for the complete combustion of liquid C2H5SH I am not sure where to start here.? Is Bright hotter than Light?

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