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Which of the following functions is equal to sin(90° - )? A. cot(90° - ) B. csc() C. csc(90° - ) D. cos()
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Jul 24, 2019
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Which of the following functions is equal to sin(90° - )?
A. cot(90° - )
B.
csc()
C.
csc(90° - )
D.
cos()
Mathematics
high-school
Uelordi
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Uelordi
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Answer
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Let
sin(90° - )------------------------ > sin (90-x)
sin(a - b
) = sin a*cos b - cos a*sin b
so
sin(90 - x) = sin 90*cos x - cos 90 * sin x
sin(90 - x) = 1*cos x - 0* sin x-------- > cos x
the answer is the option
D. cos()
Frederic Adda
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Jul 29, 2019
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Frederic Adda
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