Sin217.5 + Sin272.5 = __________?? Explain...
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Answered by
5
sin217.5°+sin272.5°
=sin2(90°−72.5°)+sin272.5°
=cos272.5+sin272.5°
[(sin(90−θ)=cosθ)]
=1
=sin2(90°−72.5°)+sin272.5°
=cos272.5+sin272.5°
[(sin(90−θ)=cosθ)]
=1
Answered by
4
sin^2 17.5° + sin^2 72.5°
= sin^2( 90- 72.5°)+ sin^2 72.5°
= cos^2 72.5° + sin^2 72.5°
= sin(90 - θ)= cosθ)
= 1
= sin^2( 90- 72.5°)+ sin^2 72.5°
= cos^2 72.5° + sin^2 72.5°
= sin(90 - θ)= cosθ)
= 1
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