verify 3 - 5sin^2 x= cos^2x+2cos2x

Verify 3-5sin^2x=cos^2x=2cos2x
in Trigonometry Answers by

Your answer

Your name to display (optional):
Privacy: Your email address will only be used for sending these notifications.
Anti-spam verification:
To avoid this verification in future, please log in or register.

1 Answer

cos2x=1-2sin^2x; cos^2x=1-sin^2x, so cos^2x+2cos2x=1-sin^2x+2-4sin^2x=3-5sin^2x QED
by Top Rated User (1.1m points)

Related questions

1 answer
how to verify this identity (cscx/1+cscx)=1-sinx/Cos^2x
asked Dec 7, 2012 in Trigonometry Answers by anonymous | 1.3k views
1 answer
Verify sin(x+y)cos(x-y)=sin(x)cos(x)+sin(y)cos(y)
asked Mar 15, 2013 in Trigonometry Answers by anonymous | 672 views
1 answer
cosθ-cos^3θ/sinθ=sinθcosθ verify trig identity
asked Mar 14, 2012 in Trigonometry Answers by anonymous | 1.0k views
1 answer
Verify: cos(180° + x) = -cos x.
asked Nov 30, 2011 in Trigonometry Answers by anonymous | 1.6k views
Welcome to MathHomeworkAnswers.org, where students, teachers and math enthusiasts can ask and answer any math question. Get help and answers to any math problem including algebra, trigonometry, geometry, calculus, trigonometry, fractions, solving expression, simplifying expressions and more. Get answers to math questions. Help is always 100% free!

Most popular questions within the last 3000 days

  1. 50+50-25X0+2+2= (19)
  2. it takes 10 road workers 5 days to complete a road repair when working 2 hours a day.Working at the same pace,how many days will it take 2 people working 5 hours a day to finish it? (3)
  3. complete the following. 825 use each digit once .make the two smallest 3 digit numbers and two largest 3-digit number (2)
  4. Solve 15 -1(12÷4+1)? (4)
  5. 8:4(5+2) (3)

Most popular tags

87,550 questions
99,628 answers
2,417 comments
440,505 users