Question

which expression is not equal to 1

Answer 1

As shown in the photo, tangent and cotangente either equal 0 or is undignified with a given degree. Every other trig function has a point when they equal 1.

Answer 2

The only option that is not equal to 1 is sinθcosθ

Acoording to trigonometric identity

cot theta = 1/tan theta

sec θ = 1/cosθ

cosec θ = 1/sinθ

For the first option:

sin θcscθ = sinθ * 1/sinθ

sinθcscθ = 1

For the second option

cosθseccθ = cosθ * 1/cosθ

cosθsecθ = 1

For the

tanθcotθ = tanθ * 1/tanθ

tanθcotθ = 1

This shows that the only option that is not equal to 1 is sinθcosθ

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