If `0^@ lt theta lt 90^@ and cos theta+sin theta=sqrt 2`, find the value of `cos 3theta`.

If 0^(@) < theta < 90^(@) "and" cos theta + sin theta = sqrt2,"find the value of" cos 3 theta.

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

If 0^(@)lt theta lt 90^(@) and cos theta=(4)/(5) find the values of cos(90^(@)+theta)

If 0^(@)lt theta lt 90^(@) and cos theta=(4)/(5) find the values of "cosec"(180^(@)+theta)

If 0^(@)lt theta lt 90^(@) and cos theta=(4)/(5) find the values of sin (270^(@)-theta)

If 0^@ lt theta lt 90^@ , find theta when 2 cos theta+2sqrt2=3sec theta

If 0lt theta lt 90^(@) , the (sin theta+cos theta) is :

If 0^(@)lt theta lt 90^(@) and cos theta=(4)/(5) find the values of tan(360^(@)-theta)

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