Math Problem Statement
sinθ+cosθ=1/2のとき、sinθ^4-cosθ^4の値を求めよ。ただし、θは鈍角とする。
Solution
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Math Problem Analysis
Mathematical Concepts
Trigonometry
Trigonometric Identities
Factorization
Formulas
sin^2θ + cos^2θ = 1
(sin^2θ - cos^2θ)(sin^2θ + cos^2θ) = sin^4θ - cos^4θ
(sinθ + cosθ)^2 = sin^2θ + cos^2θ + 2sinθcosθ
sin^2θ - cos^2θ = (sinθ + cosθ)(sinθ - cosθ)
Theorems
Pythagorean Identity
Sum and Difference of Squares
Basic Trigonometric Identities
Suitable Grade Level
Grades 10-12
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