求证:(3-sin^4α-cos^4α)/2cos^2α+1+tan^2α+sin^2α对不起,应该是求证:(3-sin^4α-cos^4α)/(2cos^2α)=1+tan^2α+sin^2α

问题描述:

求证:(3-sin^4α-cos^4α)/2cos^2α+1+tan^2α+sin^2α
对不起,应该是
求证:(3-sin^4α-cos^4α)/(2cos^2α)=1+tan^2α+sin^2α