SIN SQUARE 5 DEGREE +SIN SQUARE 10 DEGREE +SIN SQUARE 15 DEGREE+...+SIN SQUARE 85 DEGREE+SIN SQUARE 90 DEGREE=?

Asked by Vivek Sehgal | 2nd May, 2012, 01:24: PM

Expert Answer:

sin25+sin210+sin215+......+sin290
= sin2(90-85)+sin2(90-80)+......+sin285+ sin290
= cos285+cos280+......+sin285+ sin290
= (sin285+cos285)+(sin280+cos280) +......(sin250+cos250)+sin245+ sin290
= 1+1+...8 times + 1/2 + 1
=9.5 Ans

Answered by  | 3rd May, 2012, 03:19: PM

Queries asked on Sunday & after 7pm from Monday to Saturday will be answered after 12pm the next working day.