In a `DeltaABC,/_C=90^@,/_ABC=theta^@,BC=21` units and `AB=29` units. Show that `(cos^2theta-sin^2 theta )=41/841.`

Show that cos^(4)theta-sin^(4)theta=cos2theta

If sin theta+sin^2theta=1 , show that cos^4theta+cos^2theta=1 .

sin theta cos(90^@ -theta) +cos theta sin(90^@ -theta) = ?

Given ACB right angled at C in which AB=29 units ,BC=21 units and /_ABC=theta .Determine the values of cos^(2)theta+sin^(2)theta( ii) cos^(2)theta-sin^(2)theta

Consider Delta ACB, right-angled at C, in which AB=29 units,BC=21 units and /_ABC=theta .Determine the values of (i)cos2 theta+sin2 theta(ii)cos2 theta sin2 theta

Consider Delta ACB . right-angled at C, in which AB = 29 units, BC = 21 units and angle ABC = theta (see Fig) Determine the values of (i) cos^2 theta + sin^2 theta , (ii) cos^2 theta -sin^2 theta .

Consider DeltaACB , right-angled at C, in which AB =29 units, BC =21 units and /_ABC=theta . Determine the values of (i) cos2theta+sin2theta (ii) cos2thetasin2theta

If cos theta+sin theta=sqrt2 cos theta, show that cos theta-sin theta=sqrt2 sin theta .

Given , cos theta = 21/29 , what is the value of (sec theta)/(tan theta - sin theta)

If cos theta + sin theta = sqrt(2) cos theta , show that cos theta - sin theta = sqrt(2) sin theta .