` (cos 15^(@) + cos 45^(@))/(cos^(3) 15^(2) + cos^(3) 45^(@))` का मान क्या है ?

cos^(2) 45^(@) - sin^(2) 15^(@)=

4cos^(3)15^(@)-3cos15^(@)=

What is the value of (cos15^(@)+cos45^(@))/(cos^(3)15^(@)+cos^(3)45^(@))

What is the value of sin^2 45^@+ cos^2 45^@ ? sin^2 45^@+ cos^2 45^@ का मान क्या है ?

cos ^ (2) 45 ^ (@) - sin ^ (2) 15 ^ (@) =

What is the value of cos 15^@-cos 165^@ ? cos 15^@-cos 165^@ का मान क्या है?

Prove that cos (30^(@) -A ) cos (30^(@) + A ) + cos (45^(@) - A) cos (45^(@) + A) = cos 2A + (1)/(4) .

Find the value of (cos^2 30^@-sin^2 30^@)/(sin^2 15^@+cos^2 15^@) . (cos^2 30^@-sin^2 30^@)/(sin^2 15^@+cos^2 15^@) का मान ज्ञात कीजिए।