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Without using tables or calculators, simplify the following: a. sin 30° + cos 60°, b. tan 45° + 2cos 60°

Mathematics

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Answers

3 parts
a

x=6 cmx = 6 \text{ cm}

b

x=8 cmx = 8 \text{ cm}

c

x=9 cmx = 9 \text{ cm}

Step-by-step solution

9 steps

Haya, hebu tusuluhishe maswali haya.

Part a· 3 steps

  1. Tambua uhusiano wa trigonometric.

    Katika pembetatu ya kulia, tunapewa angle ya 30∘30^\circ, hypotenuse ya 12 cm12 \text{ cm}, na upande xx ambao ni kinyume na angle ya 30∘30^\circ. Uhusiano unaofaa ni sine: sin⁡θ=upande wa pilihypotenuse\sin \theta = \frac{\text{upande wa pili}}{\text{hypotenuse}}.

  2. Andika equation na badilisha thamani inayojulikana ya sin⁡30∘\sin 30^\circ.

    sin⁡30∘=x12\sin 30^\circ = \frac{x}{12}

    Tunajua sin⁡30∘=12\sin 30^\circ = \frac{1}{2}.

    12=x12\frac{1}{2} = \frac{x}{12}
  3. Suluhisha kwa xx.

    x=122x = \frac{12}{2} x=6 cmx = 6 \text{ cm}

    Jibu la mwisho ni:

    x=6 cm\boxed{x = 6 \text{ cm}}

Part b

x=8 cmx = 8 \text{ cm}

  1. Tambua uhusiano wa trigonometric.

    Katika pembetatu ya kulia, tunapewa angle ya 45∘45^\circ, upande wa pili (opposite) ni 8 cm8 \text{ cm}, na upande jirani (adjacent) ni xx. Uhusiano unaofaa ni tangent: tan⁡θ=upande wa piliupande jirani\tan \theta = \frac{\text{upande wa pili}}{\text{upande jirani}}.

  2. Andika equation na badilisha thamani inayojulikana ya tan⁡45∘\tan 45^\circ.

    tan⁡45∘=8x\tan 45^\circ = \frac{8}{x}

    Tunajua tan⁡45∘=1\tan 45^\circ = 1.

    1=8x1 = \frac{8}{x}
  3. Suluhisha kwa xx.

    x=8 cmx = 8 \text{ cm}

    Jibu la mwisho ni:

    x=8 cm\boxed{x = 8 \text{ cm}}

Part c

x=9 cmx = 9 \text{ cm}

  1. Tambua uhusiano wa trigonometric.

    Katika pembetatu ya kulia, tunapewa angle ya 60∘60^\circ, hypotenuse ya 18 cm18 \text{ cm}, na upande xx ambao ni jirani na angle ya 60∘60^\circ. Uhusiano unaofaa ni cosine: cos⁡θ=upande jiranihypotenuse\cos \theta = \frac{\text{upande jirani}}{\text{hypotenuse}}.

  2. Andika equation na badilisha thamani inayojulikana ya cos⁡60∘\cos 60^\circ.

    cos⁡60∘=x18\cos 60^\circ = \frac{x}{18}

    Tunajua cos⁡60∘=12\cos 60^\circ = \frac{1}{2}.

    12=x18\frac{1}{2} = \frac{x}{18}
  3. Suluhisha kwa xx.

    x=182x = \frac{18}{2} x=9 cmx = 9 \text{ cm}

    Jibu la mwisho ni:

    x=9 cm\boxed{x = 9 \text{ cm}}
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