`2 cos 10 A sin 4A`

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

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

(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

Evaluate : (i) (cos 3A - 2 cos 4A)/(sin 3 A + 2 sin 4A) , when A = 15^(@) (ii) (3 sin 3B + 2 cos(2B + 5^(@)))/(2 cos 3B - sin(2B - 10^(@))) , when B = 20^(@)

If cos A = 3/4 then (2cos A + 3 sin A)/(4 cos A - sin A) =

What is ( cos ^(4) A - sin ^(4) A)/( cos ^(2) A - sin ^(2) A) equal to ?

sin 2A + sin 2B + sin 2 (A-B)= A) 4 sin A * sin B * sin (A-B) B) 4 sin A * cos B * cos (A-B) C) 4 cos A * sin B * cos (A-B) D) 4 cos A * cos B * sin (A-B)

Prove that, 4 (cos^(3) 10^(@) + sin^(3) 20 ^(@))=3 (cos 10^(@) + sin 20^(@))