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7sin²ϕ + 3cos² ϕ= 4sin² ϕ+ 3sin² ϕ +3cos² ϕ = 4 4sin² ϕ+ 3(sin2 ϕ + cos2ϕ) = 4 4sin²ϕ+ 3 (1) = 4 4sin²ϕ + 4 - 3 = 1 4sin²ϕ = 1 sin²ϕ= 1/4 sin ϕ = 1/2 sin30° = 1/2 Hence, ϕ = 30
15.22 × 9.99 + 150.15 = ?
`11(2/13)` + `5(2/11)` - `3(4/9)` = ?
√323.89 × (3.20) ÷ 9.02 =?
(13.13 × 32.98) + 20.15% of 649.99 = ? + 122.34
(? + 11.86) X 14.89 = 19.89% of 2399.89
? + 39.99 X 3.01 = √624.99 X 10.01% of 49.99
? = 21.91% of (36.2 × (144.01 + 5.95)) + 16.71
1279.98 ÷ 40.48 × 10.12 = ? × 2.16
