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

find the value of sin ²5+sin²10+......................................+sin²90

find the value of  sin²5+sin²10+......................................+sin²90
 

Grade:11

1 Answers

Aarya bora
11 Points
3 years ago
Sin25+ Sin285=sin25+ cos25=1.  Similarly bro we can form pairs of 10 &80 , 15&75 20&70...25&65....30&60.....35&55....40&50....       and sin245 is ½   And sin290 is 1      So therefore 8 pairs of sin+ cos2. Therefore  8 times 1 is 8 + ½ +1/2=9+ ½
 

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