Question: Given 15 cot A = 8, find sin A and sec A
In problems like these, make sure you know all the formulas mentioned in the notes basics of trigonometry by heart. This will help you gain speed and confidence in solving problems like these.
Consider , where is .
From equation (2), we can say that and .
Wondering why we have taken "8x" and "15x" here ?
Check this video for understanding it.
Applying Pythagoras theorem on to find the value of , we get
Without doing more calculation on paper, can you find the values of tan A, cos A and cosec A? Let us know your answers in comments below and also how you got the values without calculation.