If `A=cos^2theta+s in^4theta,` prove that `3/4lt=1` for all values of `thetadot`

If A=cos^(2)theta+sin^(4)theta, prove that (3)/(4)<=A<=1 for all values of theta

If A=sin^(2)theta+cos^(4)theta, then for all real values of theta

If A= cos^(4)theta+sin^(2)theta , then for all values of theta :

Prove that: |cos theta cos(60^(@)-theta)cos(60^(@)+theta)<=(1)/(4) for all values of theta

Prove that: |sin theta sin(60-theta)sin(60+theta)|<=(1)/(4) for all values of theta

Prove that: -4le5costheta+3cos(theta+(pi)/(3))+3le10 , for all values of theta ,

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

If 0^(@) lt theta lt 90^(@) and cos^(2) theta - sin^(2) theta = (1)/(2) , then what is the value of theta ?