If the angle `theta=-30^(@)`, find the value of `cos theta`.

If the angle theta=-60^(@) , find the value of cos theta .

If tan theta=(4)/(5), find the value of (cos theta-sin theta)/(cos theta+sin theta)

If sec theta+tan theta=k find the value of cos theta

If tantheta=cot(30^(@)+theta) , Find the value of theta .

If tan theta=(a)/(b) then find the value of (cos theta+sin theta)/(cos theta-sin theta)

If sin theta=(3)/(5), then find the values of cos theta and tan theta

If sin theta = 12/13 , find the values of cos theta and tan theta . OR If cosec theta = 13/12 , then find the value of cos theta .

tan^(2)theta+sec theta=5, then find the value of cos theta

If tan theta = sqrt 3 (theta is acute angle) then find the value of 1 + cos theta .

If 4cos theta=11sin theta ,find the value of (11cos theta-7sin theta)/(11cos theta+7cos theta)