Question

3cos^2 (pi/4) - sec(pi/3) + 5tan^2 (pi/3)

Answer 1

Answer:

1pls friends it's urgent , light ray travels from one medium to another with the same refractive index

Answer 2

Answer:

14% (w/w) solution of H2SO4 means 14 g of H2SO4 is dissolved for each every 100 g of solution. Molality = 0.526 mole /kg. Therfore 4.9g contains 0.04996 moles.