Question

If 4sinA + 3 sinA= 5 then what is the value of cosA?​

Answer 1

Answer:

✨hope it may help you✨

Step-by-step explanation:

3sinA+ 4cosA=5

squaring both sides,

9sin2A + 16cos2B + 24sinAcosA = 25 (1)

4sinA - 3cosA = x

squaring both sides,

16sin^2A + 9cos^2A – 24sinAcosA = x^ (2)

Add eqns. 1) and 2)

9 + 16 = x^2

x^2 = 25

x = +5 and x = -5