exam Maths Puzzle Numerical Ability

cosx/1-sinx - 1/cosx =tanx
prove the following identites

Read Solution (Total 0)

exam Other Question

If one-half of a number is added to one-ninth of the next consecutive number, the sum is 16. What are the two numbers? Write the expression in simplest form:

4x-28
-----
5x-35

I am not sure how to do this? Thank you so much for your help :-)