1. If 3 sin θ + 5 cos θ = 5, then the value of 5 sin θ - 3 cos θ will be





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  • By: anil on 05 May 2019 01.53 am
    3 sin θ + 5 cos θ = 5
    5 sin θ - 3 cos θ = x
    On squaring them and adding, we get
    $$9 sin^2 heta + 25 cos^2 heta + 25 sin^2 heta + 9 cos^2 heta = 25 + x^2$$
    $$34 = 25 + x^2$$
    $$x = 3, -3$$
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