sin 65+cos 65=√2 cos 20
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41
Answer :
Now,
cos20
= cos (65 - 45)
= cos65 cos45 + sin65 sin45
= cos65 (1/√2) + sin65 (1/√2)
=> cos65 + sin65 = √2 cos20
=> sin65 + cos65 = √2 cos20
Hence, proved.
We used the identity rule -
cos (A - B) = cosA cosB + sinA sinB
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