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
Menu
sumanth Grade: 12th pass
        
cos 35 cos 85 cos 155=?
 
 
2 years ago

Answers : (1)

Lab Bhattacharjee
121 Points
										
cos(155)=cos(180-25)=-cos(25)
 
So, cos35 cos85 cos155 =-cos25 cos(60-25)cos(60+25)
 
Now prove 4cosx cos(60-x) cos(60+x)=cos3x
 
cos75=cos(45+30)=...
 
 
2 years ago
Think You Can Provide A Better Answer ?
Answer & Earn Cool Goodies
  • Complete JEE Main/Advanced Course and Test Series
  • OFFERED PRICE: Rs. 15,900
  • View Details

Ask Experts

Have any Question? Ask Experts

Post Question

 
 
Answer ‘n’ Earn
Attractive Gift
Vouchers
To Win!!! Click Here for details