cos 68°cos 8°+sin 68°sin 8° with all solutin
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Cos68°cos8°+sin68°sin8°
(cosAcosB+sinAsinB=cos(A-B))
Cos(68-8)
Cos60°
=1/2......
(cosAcosB+sinAsinB=cos(A-B))
Cos(68-8)
Cos60°
=1/2......
Answered by
4
The vaue of cos 68°cos 8° + sin 68°sin 8° 
Step-by-step explanation:
We have,
cos 68°cos 8° + sin 68°sin 8°
To find, the vaue of cos 68°cos 8° + sin 68°sin 8° = ?
∴ cos 68°cos 8° + sin 68°sin 8°
= cos (68° - 8°)
We know that,
The trigonometric identity,
= cos 60°
We know that,
Hence, the vaue of cos 68°cos 8° + sin 68°sin 8°
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