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

What is the value of cos 2 45 0 - sin 2 45 0 ? please answer this question with brief explination

What is the value of cos245- sin245?
please answer this question with brief explination
 

Grade:12

3 Answers

Phanindra
226 Points
3 years ago
a^2 - b^2 = (a+b)(a-b)....So... However you will get the answer without applying the formula...Cos45 = 1/root2 .. so.. cos^2 45 = 1/2Sin45 = 1/root2..so..sin^2 45 = 1/2 ...So....required answer is 0...Hope you have understood the answer..
Soumendu Majumdar
159 Points
3 years ago
Dear Student,
cos 45 = sin 45 = 1/\sqrt[]{2}
so cos^{2} 45 = sin^{2} 45 = ½
so cos^{2} 45 –  sin^{2} 45 = ½ – ½ = 0 (Ans)
If it hadn’t been 45 degrees and some other angle for which you don’t know the value of cos theta and sin theta
you can use the formula cos^{2}\Theta - sin^{2}\Theta = cos2\Theta
 
Hope it helps!
 
 
Soumendu Majumdar
159 Points
2 years ago
If you have any doubts, feel free to ask
I will be happy to help you!
And these formulas of trigonometry can be found in any maths book of class 11.
You can refer to the book to understand the formulas and it's uses
 
with regards,
Soumendu

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

10th iCAT Scholarship Test Registration Form