Trigonometric Identities and Equations

It is given that $sin⁡y=−0.2\sin y = -0.2$ and $180∘<y<270∘180^{\circ} < y < 270^{\circ}$

Find the exact value of $cos⁡y\cos y$

[3]

It is given that $sin⁡y=−0.2\sin y = -0.2$ and $180∘<y<270∘180^{\circ} < y < 270^{\circ}$

Find the exact value of $cos⁡y\cos y$

[3]

Trigonometric Identities and Equations Questions