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Mathematics 11 Online
OpenStudy (anonymous):

If cos x = sin(20 + x)° and 0° < x < 90°, the value of x is ?

OpenStudy (damonte212):

35°

OpenStudy (anonymous):

how did you get that?

OpenStudy (anonymous):

???

OpenStudy (damonte212):

--> 90 = 20 + 2x subtract 20 from both sides --> 70 = 2x

OpenStudy (anonymous):

oh okay thanks

OpenStudy (damonte212):

np

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