If `sintheta_(1)sintheta_(2)+sintheta_(3), then cos theta_(1)+cos theta_(2)+cos theta_(3)=`

If sintheta_(1)+sintheta_(2)+sintheta_(3)=3, then cos theta_(1)+cos theta_(2)+cos theta_(3)=

If sin theta_1 + sin theta_2 + sintheta_3 =3 then cos theta_1 + cos theta_2 + costheta_3 is equal to

if theta_1, theta_2, theta_3, ........, theta_n are in AP then (sintheta_1 + sintheta_2 + ....... + sintheta_n) / (costheta_1 + costheta_2 + costheta_3 + ...... + costheta_n ) =?

If 0 lt theta_(2) lt theta_(1) lt pi/4, cos (theta_(1) + theta_(2)) = 3/5 and cos(theta_(1)-theta_(2))=4/5 , then sintheta_(1) sintheta_(2) equal to

Show that there is no complex number such that |z|le1/2 and z^(n)sin theta_(0)+z^(n-1)sintheta_(2)+....+zsintheta_(n-1)+ sintheta_(n)=2 where theta,theta_(1),theta_(2),……,theta_(n-1), theta_(n) are reals and n in Z^(+) .

sintheta=7/25 then sqrt((1-cos theta)/(1+cos theta))=

If x=(cos theta)/(1-sintheta), then (cos theta)/(1+sin theta) is equal to

If : cos theta+sintheta=1, "then" : cos theta-sintheta