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If θ+ϕ=α and sin θ=k sin ϕ, then show that tan θ=k sin α1+k cos α and tan ϕ=sin αk+cos α Or If sin x=−13 and x lies in quadrant IV, then find the value of (i) sin x2 (ii) cos x2 (iii) tan x2 |
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Answer» If θ+ϕ=α and sin θ=k sin ϕ, then show that tan θ=k sin α1+k cos α and tan ϕ=sin αk+cos α Or If sin x=−13 and x lies in quadrant IV, then find the value of (i) sin x2 (ii) cos x2 (iii) tan x2 |
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