If `sqrt(2)cos A=cos B+cos^3B ,a n dsqrt(2)sinA=sinB-sin^3Bt h e nsin(A-B)=` `+-1` (b) `+-1/2` (c) `+-1/3` (d) `+-1/4`

If sqrt(2) cos A=cosB+cos^(3)B, and sqrt(2)sinA=sinB-sin^(3)B then sin(A-B)=

If angles A and B satisfy sqrt(2)cosA = cosB + cos^(3)B and sqrt(2)sinA = sinB- sin^(3)B , then the value of 1620 sin^(2) (A-B) is ……………..

cos2B + cos2A-cos2C = 1-4sin A sin B cos C

cos A + cos B + cos C = 1 + 4sin ((A) / (2)) sin ((B) / (2)) sin ((C) / (2))

Show that (1+sin A)/(cos A)+(cos B)/(1-sin B)=(2sin A-2sin B)/(sin(A-B)+cos A-cos B)

If sin B = (1)/(2), then 3 cos B - 4 cos ^(3)B is equal to (a) 1 (b) 3/4 (c) 0 (d) 2 (1)/(2)

Theorem 3:cos A+cos B+cos C=1+4(sin A)/(2)(sin B)/(2)(sin C)/(2)

cos2a-cos2b + cos2c = 1-4sin a cos b sin c

If 2sec^2A-sec^4A-2cos e c^2A+cos e c^4A=(15)/4,t h e n tan A is equal 1//sqrt(2) (b) 1/2 (c) 1/2sqrt(2) (d) -1/(sqrt(2))

In sinA=sinB and cos A=cos B , then prove that sin(A-B)/(2)=0