cosA+sin(270^@+A)-sin(270^@-A)+cos(180^@...

`cosA+sin(270^@+A)-sin(270^@-A)+cos(180^@+A)=0`

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`sin(270+A)=sin(180+(90+a))`
`=-sin(90+A)`
`=-cosA`
`sin(270-A)=sin(180+(90-A))`
`=-sin(90-A)`
`=-cosA`
LHS
`cosA-cosA-(-cosA)+(-cosA)`
...

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