Question

Solve , this

{ trigo = 11th , IIT practice set }

Answer 1

Hi ...mate.......
here is your solution..
hope it helped you...

Answer 2

Hey !!!

so simple question

As we know that

sinC + sinD = 2sin( C + D)/2* cos ( C - D )/2

and , cosC-cosD = 2sin ( C + D )/2 × sin( D - C ) /2

Using above formula
________________________
cos6¢ - cos4¢
----------------------
sin6¢ + sin4¢

=> 2sin(6¢ + 4¢ )/2× sin(4¢ - 6¢)/2
----------------------------------------------
2sin(6¢ + 4¢ )/2 ×cos(6¢ -4¢)/2

=> 2cos5¢ × -(sin¢)
-----------------------------
2sin5¢ × cos¢

=> - sin¢/cos¢ = - tan¢

hence , here , -tan¢

LHS = RHS prooved

_________________________

Hope it helps you !!!

@Rajukumar111