Astudent solving a physics problem to find the unknown has applied physics principles and obtained the expression: μkmgcosθ=mgsinθ−ma, where g=9.80meter/second2, a=3.60meter/second2, θ=27.0∘, and m is not given. which of the following represents a simplified expression for μk? a student solving a physics problem to find the unknown has applied physics principles and obtained the expression: , where , , , and is not given. which of the following represents a simplified expression for ? gsinθ−agcosθ to avoid making mistakes, the expression should not be simplified until the numerical values are substituted. tanθ− ag the single equation has two unknowns and cannot be solved with the information given.