Recent questions tagged trig identity

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Why doesn't COS40+COS30 = COS70?
asked May 31, 2022 in Trigonometry Answers by Steven Scott | 598 views
1 answer
Prove Euler's Identity
asked Nov 24, 2021 in Trigonometry Answers by anonymous | 418 views
1 answer
7cos(2x) = 7sin(4x)
asked Nov 28, 2020 in Calculus Answers by anonymous | 1.3k views
1 answer
if sin x = 0.3 what's cos x
asked Jul 24, 2019 in Trigonometry Answers by no name | 3.7k views
1 answer
Cot^2 theta -cos^2theta =?
asked Mar 14, 2019 in Trigonometry Answers by Ojas Raj | 696 views
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