Home
Old is Gold

Class Twelve Back
Physics Chemistry Biology Maths Computer English Nepali Economics Account Trivia Philosopy Social

Class Eleven Back
Physics Chemistry Biology Maths Computer English Nepali Economics Account Trivia Philosopy Social

Class Ten Back
Science Social Eph Maths Computer English Nepali Account Economics Opt math

Class Nine Back
Science Social Eph Maths Computer English Nepali Account Economics Opt math
Close Menu
Entrance

PLUS TWO Entrance Back
Practice Set One Practice Set Two Practice Set Three Practice Set Four Practice Set Five Practice Set Six Practice Set Seven Practice Set Eight Practice Set Nine Practice Set Ten Practice Set Eleven Practice Set Twelve Practice Set Thirteen Practice Set Fourteen Practice Set Fifteen

IOE Entrance Back
Practice Set One Practice Set Two Practice Set Three Practice Set Four Practice Set Five Practice Set Six Practice Set Seven

IOM Entrance Back
Practice Set One Practice Set Two Practice Set Three Practice Set Four Practice Set Five Practice Set Six Practice Set Seven

BSC CSIT Entrance Back
Practice Set One Practice Set Two Practice Set Three Practice Set Four Practice Set Five Practice Set Six Practice Set Seven

CMAT Entrance Back
Practice Set One Practice Set Two Practice Set Three Practice Set Four Practice Set Five Practice Set Six Practice Set Seven

CAMBRIDGE Entrance Back
Practice Set Thirty Three Practice Set One Practice Set Two Practice Set Three Practice Set Four Practice Set Five Practice Set Six Practice Set Seven Practice Set Eight Practice Set Nine Practice Set Ten Practice Set Eleven Practice Set Twelve Practice Set Thirteen Practice Set Fourteen Practice Set Fifteen Practice Set Sixteen Practice Set Seventeen Practice Set Eighteen Practice Set Nineteen Practice Set Twenty Practice Set Twenty One Practice Set Twenty Two Practice Set Twenty Three Practice Set Twenty Four Practice Set Twenty Five Practice Set Twenty Six Practice Set Twenty Seven Practice Set Twenty Eight Practice Set Twenty Nine Practice Set Thirty Practice Set Thirty One Practice Set Thirty Two Practice Set Thirty Four Practice Set Thirty Five Practice Set Thirty Six Practice Set Thirty Seven Practice Set Thirty Eight Practice Set Thirty Nine Practice Set Fourty Practice Set Fourty One Practice Set Fourty Two Practice Set Fourty Three Practice Set Fourty Four Practice Set Fourty Five Practice Set Fourty Six Practice Set Fourty Seven Practice Set Fourty Eight Practice Set Fourty Nine Practice Set Fifty Practice Set Fifty One Practice Set Fifty Two Practice Set Fifty Three Practice Set Fifty Four Practice Set Fifty Five Practice Set Fifty Six Practice Set Fifty Seven Practice Set Fifty Eight
Close Menu
USA Guide

Introduction

Application

Todo in high school

Opportunity fund

Building application

Eca opportunities

English proficiency tests

Sat resources

Scholarships hunt

Visa process

Visa interview day

Prepare to fly

Gap year

Success stories

Know colleges

News
Close Menu
Sign In

Log in with Google or Log in with email Sign up with email

ask mattrab

4 Maths -- Trigonometry

Prove that: c2cos2B + b2cos2C + bc cos(B-C) = 1/2 (a2+ b2+c2)

Prove that: c²cos²B + b²cos²C + bc cos(B-C) = 1/2 (a²+ b²+c²)

1 Happy Submit Answer

0 Answers

© 2022 Mattrab Community.
Privacy.
Terms & Conditions.
Affiliate Program.
About Mattrab.
FAQs and Help.