question 5th quick

question 5th quick sm Y cos (Y cos (900 — O) sec (900 — 0) tan O tan (900 — O) (iv) cosec (900 — O)sin (900 — 0) cot (900 — 0) cot O cos (900 — 0) 1 +sin (900-0) = 2 cosec 0 Ul + sin (900 - 0) cos (900 — 0) sec (900 — 0) cosec 0 — tan (900 — 0) cot 0 + cos2250 + cos2 (vi) 3 tan 270 tan 630