If 5 sinA+3cosA=5, prove 3sinA-5cosA=+/-3
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Let the ans to be founded be x now, squaring both the equations we will get
25 sinA2 + 9 cosA2= 25..
....eq 1
9sinA2 + 25cosA2 = x2.....eq2
Now add eq 1 nd 2...
25 sinA2+9 sinA2+25cosA2+9 cosA2= 25+x2
34sinA2+34 cosA2= 25+x2
34( sinA2+cosA2)= 25+ x2
34*1=25+ x2
34-25= x2
9= x2
X= +/- 3....Ans
00007:
Thnx jenya
Btw how did u study all this at 1r
14*
It was so simple yrrr....
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