cos²20+cos²65whole by sin²40+sin²50 find the value
rishimhaske:
this question is wrong .........we cant simplify Cos²20+cos²65....for more detailes see same question posted on yesterday....also see its comments....delte this question
it is not cos20 25
means
it's not cos square 20 it is cos square 25
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bye using some corrections given in comments,
sin(90-Ф)=cosФ
and by pythagoras identity,
sin²+cos²=1
so.....
=sin²25+cos²25/(sin²50+cos²50)
=1/1
=1
sin(90-Ф)=cosФ
and by pythagoras identity,
sin²+cos²=1
so.....
=sin²25+cos²25/(sin²50+cos²50)
=1/1
=1
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