Let `z=costheta+isintheta`. Then the value of `sum_(m->1-15)Img(z^(2m-1))` at `theta=2^@` is: 1. `1/sin2^@` 2. `1/(3sin2^@)` 3. `1/sin2^@` 4. `1/(4sin2^@)`

Let z=costheta+isintheta . Then the value of sum_(m->1-15)Img(z^(2m-1)) at theta=2^@ is:

Let z=costheta+isintheta . Then the value of sum_(m->1-15)Img(z^(2m-1)) at theta=2^@ is:

Let z=cos theta+isintheta . Then the value of sum_(m-1)^(15)Im(z^(2m)-1) at theta=2^(@) is

Let z=costheta+isintheta . Then the value of sum_(m=1)^15 Im(z^(2m-1)) at theta=2^@ is:

Let z=costheta +i sintheta . Then, the value of sum_(m=1)^15Imz^(2m-1) at theta = 2^@ is

Let z=cos theta+i sin theta then the value of sum_(m=1)^(30)Im(z^(2m-1)) at theta=2^(@) is.

Let z=cos theta+i sin theta. Then the value of sum_(m rarr1-15)Img(z^(2m-1)) at theta=2^(@) is: 1.(1)/(sin2^(@)) 2.(1)/(3sin2^(@))3*(1)/(sin2^(@))4*(1)/(4sin2^(@))

If cos^(4)theta-sin^(4)theta=(2)/(3) , then the value of 1-2sin^(2)theta is

If cos^4 theta - sin^4 theta = 2/3 ,then the value of 1 - 2 sin^2 theta is