The answer must be a multiple of π. Note that π is already provided in the answer so you must give the appropriate multiple. Give exact answers. No decimal numbers. The answer should be a fraction or an integer. E. g. if the solution is π2, the answer should be entered as 1/2. If there is more than one answer enter them separated by commas.

2sintcost+sint−2cost−1=0
answer must be t=[ ]pi