Q no 10

Asked by sucharitasahoo1 | 26th Nov, 2017, 10:11: AM

Expert Answer:

begin mathsize 16px style cos space straight A space minus space sin space straight A equals 1
now space squaring
open parentheses cos space straight A space minus space sin space straight A close parentheses squared equals cos squared space straight A space plus space sin squared space straight A minus 2 cos space straight A cross times sin space straight A
1 equals 1 minus 2 cos space straight A cross times sin space straight A
sin space straight A space cross times cos space straight A equals 0
open parentheses cos space straight A space plus space sin space straight A close parentheses squared equals cos squared space straight A space plus space sin squared space straight A plus 2 cos space straight A cross times sin space straight A
cos space straight A space plus space sin space straight A equals plus-or-minus 1 end style

Answered by Arun | 26th Nov, 2017, 04:39: PM