✨HERE IS YOUR ANS ✨

SINQ-2SIN³Q/2COS³Q-COSQ

NOW ,, IF BOTH NUMERATOR AND DENOMINATOR BY- COSQSINQ

SO, THEN ----. 1-2SIN²Q/COSQ/2COS²Q-1/SINQ

NOW,, WE KNOW THAT :

✨1-2SIN²Q = COS2Q

✨2COS²Q-1 = COS2Q

SO, COS2Q/COSQ/COS2Q/SINQ

THEN , SINQ/COSQ

SO, HENCE == TANQ PROVED..

☺️HOPE IT HELPS U ☺️