Answer:
14x+42y
Step-by-step explanation:
7(2x+6y)
14x+42y
Step-by-step explanation:



Equating,




Placing it,



Answer:


let us first take a look at the values of the trigonometric ratios given in the question so that we get quite clear about what is to be done.
here ,

now ,
we just have to plug in the values considering certain other things given in the question and we're done!
so let's start ~

hence , proved ~
hope helpful :D