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Using your knowledge that tan(x) = sin(x) / cos(x) , how would you write 4/7tan(x)

Since tanx = sinx / cosx that means that the inverse of tan must = the inverse of sinx / cosx which is cosx / sinx . So we know that 1/tanx = cosx . Now all we have to do is apply the multiple 4/7 becaus...

Answered by • Maths tutor

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A is the point with coordinates (5, 9) B is the point with coordinates (d, 15) The gradient of the line AB is 3 Work out the value of d.

A straight line equation is defined as y=mx+c where m is the gradient and c is the intercept. Since the gradient is already said to be 3 we can substitute this in to mean the equation for AB is y=3x+c. Si...

Answered by Tarun A. • Maths tutor

9712 Views

Outline THREE reasons for gender differences in educational achievement.

One reason for gender differences in educational achievement is the impact of feminism. Feminism has encouraged girls ambition and widened their perceived life choices thus encouraging female achievement ...

Answered by Pandora M. • Sociology tutor

36165 Views

Find all solutions of the equation in the interval [0, 2π]. 5 cos^3 x = 5 cos x

5cos³x = 5cosxFirstly -5cosx from both sides and divide through by 5We have:cos³x-cosx = 0We can factorise this:cosx(cos²x - 1) = 0 For this to be true either:cosx = 0 or ...

Answered by Georgiana C. • Maths tutor

4289 Views

How does ionisation energy vary across a period in the periodic table?

Ionisation energy generally increases across a period in the periodic table. This is because across a period, one more proton is added to the nucleus. This increases the quantity of positive charge so the...

Answered by Jenni V. • Chemistry tutor

1932 Views