Without trigonometric table find the value of cos70/sin20 + cos59/sin31 - 8sin^230
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cos(90-20)=sin(20) it's using property cos (90-A)=sinA
similarly
cos(90-31)=sin(31)
sin(30)=1/2 as it's a standard value use should know that
use above and solve it
similarly
cos(90-31)=sin(31)
sin(30)=1/2 as it's a standard value use should know that
use above and solve it
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