Can anyone give step by step explanation for this ..No negative comments pls
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the question is prooved.
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sin70∘−cos40 ∘
=sin70∘ −cos(90 ∘ −50 ∘ )
=sin70 ∘ −sin50 ∘
=2sin( 70 ∘ −50 ∘/2 )cos( 70 ∘+50 ∘/2 )
=2sin10 ∘cos60 ∘
=2sin10 ∘ ⋅1/2
=sin10 ∘
hope it will help you
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