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Hemanth Sai Grade: 11

please solve any of these or both please:


    *1)2sin(two sin square)y+4cos(x+y)sin(x)sin(y)+cos2(x+y)=

         a)cos 2x           b)cos2y          c)sin2x        d)sin2y

    *2) and very useful trignomentry tips and easy ways.

7 years ago

Answers : (1)

Askiitians_Expert Yagyadutt
askIITians Faculty
74 Points
										Hii Hemanth 

Question 1 is not clear bro..

use ^ for power..

like sin to the power 2  = sin^2(x) 
sin^2(x+y) + cos^2(x+y) + cos2(x+y)   then it will be clear which is 2x which is square x.

For second question (2) 

In any chapter of must do as much practice as u can to make it stronger.
There is book named as "Objective Approach in Mathematics" by Amit M Agrawal

In vol 1 ..Trignometry is given..In this book all class of problems are you can solve it..

And After solving atleast 200 question in trignometry you will have good command on do as much practice as you can....Practice will give you your own tips and ways..

After solving 50 question from the previous year jee will see you can solve all of them...

WIth regards


7 years ago
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