Universecolors
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I do NOT know how to solve part iii , can someone please help me

Thefunction f is such that f(x)=2sin2x−3cos2xfor0≤x≤ €.

(i) Express f(x) in the form a + b cos2 x, stating the values of a and b. [2]

(ii) State the greatest and least values of f(x). [2]


iii) Solve the equation f(x) + 1 = 0.
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RDKGames
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(Original post by Universecolors)
I do NOT know how to solve part iii , can someone please help me

Thefunction f is such that f(x)=2sin2x−3cos2xfor0≤xâ‰¤Ï €.

(i) Express f(x) in the form a + b cos2 x, stating the values of a and b. [2]

(ii) State the greatest and least values of f(x). [2]


iii) Solve the equation f(x) + 1 = 0.
You can use part (i) to help you with that.
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