Jiayang's answer to Someday's Junior College 1 H1 Maths question.
Can i ask ? How 12 cos x - 5 sin x = -5 can be cos x=0 sin x=1 ?
Can. When x=½π
This js through observation. If you wanna be more analytical then use the R-formula one and solve
Like what I’ve done in part b
Oo thnks . Can i ask 1 more question? Isnt 3π/2 bigger than 4.32 ? So why 3π/2 < x < 4.32 ?
Cos sin(1.5π) =\= 1. My bad...
However, we can use symmetry to solve after knowing π/2... Look at my next post
However, we can use symmetry to solve after knowing π/2... Look at my next post
Thnkyou so much
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