3sin^2x+sin2x-5cos^2x=0HELP2sin4xcosx+sin7x=0

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3sin^2x+sin2x-5cos^2x=0HELP2sin4xcosx+sin7x=03sin^2x+sin2x-5cos^2x=0HELP2sin4xcosx+sin7x=03sin^2x+si

3sin^2x+sin2x-5cos^2x=0HELP2sin4xcosx+sin7x=0
3sin^2x+sin2x-5cos^2x=0
HELP
2sin4xcosx+sin7x=0

3sin^2x+sin2x-5cos^2x=0HELP2sin4xcosx+sin7x=0
题目让干什么?拜托说明白点啊!