acos²θ+asin²θ=?是acos²θ+bsin²θ=?

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acos²θ+asin²θ=?是acos²θ+bsin²θ=?acos²θ+asin²θ=?是acos²θ+bsin²θ

acos²θ+asin²θ=?是acos²θ+bsin²θ=?
acos²θ+asin²θ=?
是acos²θ+bsin²θ=?

acos²θ+asin²θ=?是acos²θ+bsin²θ=?
acos²θ+asin²θ
=a(cos²θ+sin²θ)
=a