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Prove the following: sinthetasin(90^0-th...

Prove the following: `sinthetasin(90^0-theta)-costhetacos(90^0-theta)=0`

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`sin(90^@−θ)=cosθandcos(90^@−θ)=sinθ`
L.H.S`=sinθ sin(90^@−θ)−cosθ cos(90^@−θ)`
`=sinθ cosθ−cosθ sinθ`
=0=R.H.S
...
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