Q3 of 104 Page 188

If cosA = find sinA and tanA.



Let AB = 4 and AC = 5



BC = 3 (by Pythagoras theorem)


we know that





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More from this chapter

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1

In ΔABC, m∠A = 90. If AB = 5, AC = 12 and BC = 13, find sinC, cosC, tanB, cosB, sinB.

 2

In ΔABC, m∠B = 90. If BC = 3 and AC = 5, find all the six trigonometric ratios of ∠A.

 4

If cosec θ = find tan θ and cos θ.

 5

If cosB = , find the other five trigonometric ratios.