" 17."sec2 theta-tan2 theta=tan((pi)/(4)-theta)

sec theta+tan theta=tan((pi)/(4)+(theta)/(2))

If theta in((pi)/(4),(pi)/(2)) and f(theta)=sec 2theta- tan 2theta , then f((pi)/(4)-theta)=

(sec theta-tan theta)/(sec theta+tan theta)=cos^(2)((pi)/(4)+(theta)/(2))

Prove that sec theta + tan theta = tan (pi/4 + theta/2)

Prove that sec theta + tan theta = tan (pi/4 + theta/2)

Prove that: tan((pi)/(4)+theta)+tan((pi)/(4)-theta)=2sec2 theta

sqrt((1-sin theta)/(1+sin theta))={sec theta-tan theta, if -(pi)/(2)

Prove that tan((pi)/(4)+theta)-tan((pi)/(4)-theta)=2tan2theta .

Prove that : tan((pi)/(4)+theta)+tan((pi)/(4)-theta)=2sec2 theta

Prove that: sqrt((1-sintheta)/(1+sintheta))= sec theta- tan theta when (-pi/2) < theta < pi/2 and -sec theta+tan theta when pi/2< theta< (3pi)/2