सिद्ध कीजिए कि
`4(cos^(3)10^(@)+sin^(3)20^(@))=3(cos10^(@)+sin 20^(@))`

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

i) Prove that: cos^(3)2A+3cos2A = 4(cos^(6)A-sin^(6)A) ii) Prove that: 4(cos^(3)10^(@) + sin^(3)20^(@)) = 3(cos10^(@)+sin20^(@))

Prove the following 4(cos^(3)10^(@)+sin^(3)20^(@))=3(cos10^(@)+sin20^(@))

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

Show that 4(cos^3 10^@+sin^3 20^@)=3(cos10^@+sin20^@)

Prove the following identity: 4(cos^(3)10^(0)+sin^(3)20^(@))=3(cos10^(0)+sin20^(@))

(cos20^(@)-sin20^(@))/(cos20^(@)+sin20^(@))=tan25^(@)

Which of the following numbers is/are twin prime with 5(C)4((cos^(3)10^(0)+sin^(3)20^(@))/(cos10^(0)+sin20^(@)))(D)(cos68^(@))/(sin56^(@)sin34^(0)tan22^(@))

1/(sin10^(@))-sqrt3/(cos10^(@))=

[Prove the following 8cos^(3)10^(@)-8sin^(3)20^(@)-6cos10^(@)+6sin20^(@)=2sqrt(3)