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let sin(x)=u , let cos(x)=v

du/dx = cos(x),   dv/dx = -sin(x)

d[sin(x)cos(x)]/dx = v.du/dx + u.dv/dx

= cos^2(x) - sin^2(x)

Work done = Force in direction of motion (horizontal in this case) x distance. Force in direction of motion is 120 x cos(26) (draw a diagram to help visualise this) and distance is 5. Therefore work done ...

The probability they wear glasses is 3/7, which means the probability they don't is 1-3/7=4/7. This means 164 students make up 4/7 of the school. To find the number that wear glasses we need to find how m...

Capitalism is an economic system characterised by private ownership of key resources such as the means of production. The Marxist perspective argues that the family is a key social institution which meets...

It is very good that you can already spot them, that in itself is not always obvious or easy! The important thing is to then explain their effect. What do they add to the passage? Look at the context and ...