IF SECA=15/7 AND A +B=90 FIND THE VALUE OF COSEC B 

Asked by apporv1999 | 13th Aug, 2014, 08:32: PM

Expert Answer:

G i v e n space S e c space A equals 15 over 7 rightwards double arrow cos space A equals 7 over 15 comma space S i n space A equals fraction numerator square root of 176 over denominator 15 end fraction A plus B equals 90 T a k e space C o s space o n space B o t h space S i d e s comma space w e space g e t  C o s space left parenthesis A plus B right parenthesis equals space C o s space 90 C o s thin space A space C o s space B space minus space S i n space A space S i n space B equals 0 C o s space A space C o s space B equals S i n space A space S I n space B  S u b s t i t u e space a b o v e space v a l u e s space o f space S i n space A space a n d space C o s space A  C o t space B equals fraction numerator square root of 176 over denominator 7 end fraction  S o space I f space C o t space B equals fraction numerator square root of 176 over denominator 7 end fraction rightwards double arrow T a n space B equals fraction numerator 7 over denominator square root of 176 end fraction comma space S i n space B equals 7 over 15 rightwards double arrow C o s e c space B equals 15 over 7

Answered by Dharma Teja | 14th Aug, 2014, 08:12: AM