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(cos 2A cos 3A- cos 2A cos 7A+ cos A cos...

`(cos 2A cos 3A- cos 2A cos 7A+ cos A cos 10A)/( sin 4A sin 3A -sin 2A sin 5A +sin 4A sin 7A)=cot6A*cot5A`

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Prove that: (cos 2A cos 3A-cos 2A cos 7A + cos A cos 10A)/(sin 4A sin 3A -sin 2A sin 5A + sin 4A sin 7A)= cot 6A cot 5A .

Prove that: (cos 2A cos 3A -cos 2A cos 7A + cos A cos 10A)/("sin" 4A sin 3A - sin 2A sin 5A + sin 4A sin 7A) = cot 6A cot 5A

(cos2A cos3A-cos2A cos7A+cos A cos10A)/(sin4A sin3A-sin2A sin5A+sin4A sin7A)=cot6A*cot5A

(cos2A cos3A-cos2A cos7A+cos A cos10A)/(sin4A sin3A-sin2A sin5A+sin4A sin7A)=cot6A cot5A

Prove that: (cos2A\ cos3A-cos2Acos7A+cos10 A cos A)/(sin4A\ sin3A-sin2A sin5A+sin4Asin7A )=cot6A\ cot5A

( cos A + cos 3A + cos 5A + cos 7A )/( sin A + sin 3A + sin 5A + sin 7A ) =

(cos 7A + cos 5A)/(sin 7A-sin 5A)=

(cos 7A + cos 5A)/(sin 7A-sin 5A)=

Prove that: quad quad cos2A cos2A-2cos2A+2cos10A cos As in4As in3A-s in2As in5A=s in4A sin7As in4A=cot6A cot5A

(sin A sin2A + sin3A sin6A) / (sin A cos2A + sin3A cos6A) = tan5A