SAT Math Practice Question #30287 - SATify | SATify

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SAT Math Practice Question #30287 - SATify | SATify

#30287

identities

trigonometry

easy

40 sec

If $sin 2 0^{\circ} = k$ , which of the following expressions is equivalent to $cos 7 0^{\circ}$ ?

A.

$k$

B.

$1 - k$

C.

$1 - k^{2}$

D.

$k^{2}$