proof it sinsqare 70 +cos sqare 110 =1
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5
Answer:
sin²70+cos²110
sin²70+cos²(180-70)
sin²70+cos²70
we know that
sin²A+cos²A=1
so ,
sin²70+cos²70=1
prove that.....
Answered by
1
Answer:sin²70+cos²110=
Sin²(90-20)+cos(90+20)
=cos²20+sin²20
=1
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