P2 9709 mathematics easy question help

[Anstasia]

How do find greatest and least possible values in general?!
Example: (Mj 2011 /21)
The answer in ms is : obtain 60 for their value of R & obtain 8
! Help please my exam is in October this month

 

[Anstasia]

what do you mean by "add" maths? this is 9709 mathematics paper 2. even exists in paper 3(AL)

 

[Anstasia]

Heyy I didn't ask if it's hard or easy I asked if people could solve this for me please <3 thanks eman

 

[Anstasia]

Sweetheart I asked this in the CIE section there will be millions who are studying and doing this and this is p2 not even p3 <3 maybe you don't know but ofcourse others do

 

[MazenAlosali]

1 - You should simplify this equation to be as a quadratic equation either in cos or sin

2 - the max value for each of these ( sin or cos ) is 1 and the least is -1 so you just substitute by 1 once and then by -1

Try this

 

[Anstasia]

1 - You should simplify this equation to be as a quadratic equation either in cos or sin

2 - the max value for each of these ( sin or cos ) is 1 and the least is -1 so you just substitute by 1 once and then by -1

Try this

Thank you!