Most voted puzzles under tag trigonometry

+2 votes

Trigonometry: tanA+secA=x than prove that sinA=x²-1/x²+1

posted Dec 10, 2017 by Rohit Kumar

• trigonometry
• mathematical

+1 vote

What is the value of sin^4 1 + sin^4 2 + sin^4 3 + sin^4 4 ... sin^4 88 + sin^4 89 = ?

posted Aug 10, 2018 by anonymous

• trigonometry
• trignomatry

+1 vote

If sin x + sin y + sin z = 0 and cos x + cos y + cos z = 0 then what is the value of cos (x - y) = ?

posted May 18, 2018 by Rahul Vaidya

• mathematical
• trigonometry