Flag Trigonometry> If 1+sin a=9 cos a & 0 sin a 2 sin a 4 si...
question mark

If 1+sin a=9 cos a & 0
  1. sin a
  2. 2 sin a
  3. 4 sin a 
  4. tan a

yathish , 8 Years ago
Grade 11
anser 1 Answers
Vikas TU

Last Activity: 8 Years ago

i think i have already answered this question,
check again if so,
1+sin a=9 cos a 
Divide by cosa both sides, we get
seca + tana = 9
seca = 9 – tana
squaring both sides,
(seca)^2 = 81 + (tana)^2  – 18tana
1 + (tana)^2  = 8` + tana^2 – 18tana
tan a = 7/18
cosa = 18/root(49 + 18^2)
sina = 7/root(49 + 18^2)
now cross check with all the options.

Provide a better Answer & Earn Cool Goodies

Enter text here...
star
LIVE ONLINE CLASSES

Prepraring for the competition made easy just by live online class.

tv

Full Live Access

material

Study Material

removal

Live Doubts Solving

assignment

Daily Class Assignments


Ask a Doubt

Get your questions answered by the expert for free

Enter text here...