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Ackussinglake63
06.07.2019 •
Spanish
What is the error in each sentence? re-write the sentences correctly and explain the error in each sentence. ( i know how to rewrite it but why is the original sentences wrong? ) yo nadar- yo nado ellos cantamos- ellos cantan yo cantas- yo canto
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Ответ:
Ответ:
Explanation:
Given the trigonometry expression sin⁴θ+cos⁴θ , the minimum value of the expression occurs at when θ = 0° and maximum value occurs at when θ = 90°.
From trigonometry identity;
sin²θ+cos²θ = 1
square both sides;
(sin²θ+cos²θ)² = 1²
open the parenthesis;
sin⁴θ+2sin²θcos²θ+cos⁴θ = 1
subtract 2sin²θcos²θ from both sides;
sin⁴θ+2sin²θcos²θ+cos⁴θ-2sin²θcos²θ = 1-2sin²θcos²θ
sin⁴θ+cos⁴θ = 1-2sin²θcos²θ
Since the minimum value occur at θ = 0°, substitute θ = 0° into the right hand side of the resulting expression as shown;
sin⁴θ+cos⁴θ = 1-2sin²(0)cos²(0)
sin⁴θ+cos⁴θ = 1-2(0)(1)
sin⁴θ+cos⁴θ = 1-0
sin⁴θ+cos⁴θ = 1
Hence the minimum value of sin⁴θ+cos⁴θ is 1
For the maximum value;
Since the maximum value occur at θ = 90°, substitute θ = 90° into the right hand side of the resulting expression as shown;
sin⁴θ+cos⁴θ = 1-2sin²(90)cos²(90)
sin⁴θ+cos⁴θ = 1-2(1)(0)
sin⁴θ+cos⁴θ = 1-0
sin⁴θ+cos⁴θ = 1
Hence the maximum value of sin⁴θ+cos⁴θ is also 1