sin2A−sin2B +sin2C=? [ যখন, A+B+C=π]
A. 2cosA sinB cosC
B. 4 cosA sinB cosC
C. cosA sinB cosC
D. cosA tanB cosC
সঠিক উত্তরঃ
B.
4 cosA sinB cosC
Explanation: 
Related Questions (Any University/Year)
- (1-cosbeta+sinbeta)/(1+cosbeta+sinbeta)=?
- cos^2(A/2){1+tan(A/2)}^2=?
- প্রমাণ কর, cos22A+cos22B+cos22C=1+2 cos2A cos2B cos2C। [যেখানে, A+B+C=π ]
- (cos26°−cos64°)/(cos26°+cos64°)=?
- (π/4+alpha)sec(π/4-alpha)=?
- 1/asinA+1/bsinB+1/csinC=?
- ABC ত্রিভুজের, cosA+cosC=sinB হলে, ত্রিভুজটির নাম কী?
- cos(45°−α)=?
- (1-cos2alpha+sin2alpha)/(1+cos2alpha+sin2alpha)=?
- 1/acos^2(A/2) +1/b cos^2(B/2)+1/c cos^2(C/2)=?
- sinB+cos(27/2π+B)+cos(27/2π-B)+sin(19π+B)=?