यदि ` A = 30^(@)` तो सत्यापित कीजिए कि ` cos 2A = cos^(2) A - sin^(2) A ` .

If A =30^(@) ,verify that cos2A =cos^(2)A-sin^(2)A .

If A =30^(@) ,verify that cos2A =cos^(2)A-sin^(2)A .

If A= 30^@ verify that :- cos2A= cos^2A-sin^2A .

If A = 60 ^(@) and B = 30 ^(@) , find the value of (sin A cos B+ cos A sin B)^(2) + (cos A cos B - sin A sin B )^(2)

यदि triangleABC में (If इन triangleABC), a = (1)/(sqrt(6)-sqrt(2)), b = (1)/(sqrt(6)+sqrt(2)), C = 60^(@) तो सिद्ध कीजिए कि (Prove that) c = (sqrt(4))/(2) .

If A = 30^(@) , show that : (i) (1 + sin 2A + cos 2A)/(sin A + cos A) = 2 cos A (ii) (cos^(3)A - cos 3A)/(cos A) + (sin^(3)A + sin 3A)/(sin A) = 3

cos^(2)30^@-sin^(2)30^@=cos60^@

Prove that cos 60^(@)=cos^(2)30^(@)-sin^(2)30^(@) .

Prove that : (i) sin 60^(@) = 2 sin 30^(@) cos 30^(@) (ii) 4(sin^(4) 30^(@) + cos^(4) 60^(@)) - 3(cos^(2)45 - sin^(2)90^(@)) = 2

(7sin ^ (2) 30 ^ (@) + 3cos ec ^ (2) 60 ^ (@) - cot ^ (2) 45 ^ (@)) / (sin ^ (2) 70 ^ (@) + sin ^ (2) 20 ^ (@)) + 2sin ^ (2) 30 ^ (@) - 2cos ^ (2) 30 ^ (@) 20