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#cos(pi/24) = ?# #A. # #sin((11pi)/24)# #B. # #sin((23pi)/24)# #C. # #sec((23pi)/24)# #D. # #sec((11pi)/24)#

1 Answer

Apr 5, 2018

A

Explanation:

Trigonometric Identity:

#cos(x)=sin(pi/2-x)#

SO

#cos(pi/24)=sin(pi/2-pi/24)#

#cos(pi/24)=sin((12pi)/24-pi/24)#

#cos(pi/24)=sin((11pi)/24)# --> A is your answer

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