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What is cos2x

2cos^2x−1
2sinxcosx
cosxsinx
cos^2x
What is Sin^2x+Cos^2x

tan^2x
1
2
sec^2x
What is the identity of cosecantΘ

1/sinΘ
1/secΘ
1/tanΘ
1/cosΘ
4tan A/1-tan^4A=tan 2A+sin2A
if B=55 and a=5,find b
Prove-

sin^3A * sin^3(120+A) * sin^3(sin240+A) = 3/4 cos3A
1. Prove (1-cosA) ( 1-secA) = tanA sinA

2. Prove secA (1-sinA)(secA+tanA ) = 1
What is the identity of tanΘ

1/cotΘ
1/tanΘ
1/cscΘ
1/sinΘ
What is the identity of CosΘ

1/cscΘ
1/cosΘ
1/secΘ
1/sinΘ
What is the identity of SinΘ

1cscΘ
1/secΘ
1/cotΘ
1/tanΘ
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