Trigonometrical...

Find the value of tan 1^o tan 2^o tan 3^o … tan 89^o.

Solve: sec 40^o sin 50^o + cos 40^o cosec 50^o

What is the value of sinθ. cosθ[tanθ + cotθ]?

Find the value of sin 43^o cos 47^o + cos 43^o sin 47^o.

Solve for θ, if 2 tan θ - sec θ - √2 (2 sin θ - 1) = 0, where 0 < θ < 90^o.

Find the value of cos 22.5^o cos 67.5^o – sin 22.5^o sin 67.5^o.

If sin (2B - A) = 2 sin (3A - B) = , find the value of 2A - B.

If sin²θ - 3 cos²θ​​​​​​​ = 0, find the value of 2 tan²θ​​​​​​​ - secθ​​​​​​​ + 3 and acute angle θ​​​​​​​.

If 3 - 3 cos A - 2 sin² A = 0, then the measure of angle A is