Thank you for registering.

One of our academic counsellors will contact you within 1 working day.

Please check your email for login details.
MY CART (5)

Use Coupon: CART20 and get 20% off on all online Study Material

ITEM
DETAILS
MRP
DISCOUNT
FINAL PRICE
Total Price: Rs.

There are no items in this cart.
Continue Shopping

if cos3x/cosx = 1/3 (0 what is the value of sin3x/sinx ?

if cos3x/cosx = 1/3 (0<=x<=90)
what is the value of sin3x/sinx ?

Grade:11

2 Answers

shubhra pathak
15 Points
10 years ago

cos3x/cosx= (4cos^3 x-3cosx)/cosx=1/3

=> 4cos^2 x-3=1/3

cos^2 x=5/6

as we know that cos^2 x+sin^2 x=1

so,  sin^2 x=1/6

and    sin3x/sinx= (3sinx-4sin^3 x)/sinx

=> 3-4sin^2 x=7/3

asnwer>> 7/3

Shreya Chandwadkar
14 Points
10 years ago

thank you !! but i could solve it.... by the same method after posting it!!

Think You Can Provide A Better Answer ?

Provide a better Answer & Earn Cool Goodies See our forum point policy

ASK QUESTION

Get your questions answered by the expert for free