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Carlosruelas5409
10.07.2019 •
Mathematics
Use trig identities to transform the left side of the equation to the right side. (1+sintheta)(1-sintheta)=cos2theta ! i will medal!
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Ответ:
Answer and explanation
(1+sinθ)(1-sinθ)=cos²θ
We are to prove that the left hand side is equal to the right hand side.
(1+sinθ)(1-sinθ) = 1(1-sinθ) + sinθ(1-sinθ)
= 1 - sinθ + sinθ - sin²θ
= 1 - sin²θ
From the trigonometric identity sin²θ + cos²θ = 1,
1 - sin²θ = cos²θ
Ответ:
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Step-by-step explanation:
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