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junior college 1 H1 Maths

Help me TT

Date Posted: 5 years ago

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Date Posted: 5 years ago

Someday

5 years ago

Can i ask ? How 12 cos x - 5 sin x = -5 can be cos x=0 sin x=1 ?

Jiayang

5 years ago

Can. When x=½π

Jiayang

5 years ago

This js through observation. If you wanna be more analytical then use the R-formula one and solve

Jiayang

5 years ago

Like what I’ve done in part b

Someday

5 years ago

Oo thnks . Can i ask 1 more question? Isnt 3π/2 bigger than 4.32 ? So why 3π/2 < x < 4.32 ?

Jiayang

5 years ago

Cos sin(1.5π) =\= 1. My bad...

However, we can use symmetry to solve after knowing π/2... Look at my next post

Someday

5 years ago

Thnkyou so much

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Date Posted: 5 years ago